Our ultralight backpacks gear analyst team is made up of passionate backpackers who, over the years, have collectively covered tens of thousands of miles with a slew of different packs. We’ve thru-hiked many of the United State’s prized long trails, such as the Pacific Crest Trail, the Appalachian Trail, the Colorado Trail, the Arizona Trail, CDT, and the list goes on. We’ve carried packs from big box brands like REI to cottage companies like ULA, Gossamer Gear, and Atom Packs. You name it, and we’ve probably tried it.
In the guide below, we’ll break down the different ultralight packs in terms of comfort, functionality, water resistance, and construction so you can find the perfect one to accompany you on the journey of a lifetime. If you need more carrying capacity or a heavier-duty option, we also have a lineup of our favorite traditional backpacking packs.
And for more info, check out some of our other most popular gear guides:
Quick Picks for Ultralight Backpacks
Check out this quick list of the best ultralight backpacks, or continue scrolling to see our full list of favorites with in-depth reviews.
Best Ultralight Pack Overall: Hyperlite Mountain Gear Unbound 40 ($369)
Most Versatile Ultralight Pack: Atom Packs The Pulse EP50 ($274)
Best Frameless Pack: Nashville Pack Cutaway ($326)
Most Comfortable Ultralight Pack: Gossamer Gear Mariposa 60 ($315)
Best Load Hauler: ULA Circuit ($300)
Best Minimalist Pack: Hyperlite Mountain Gear Southwest 55 ($379)
Lightest Large Capacity Pack: Zpacks Arc Haul Ultra 60 ($399)
Well-Priced & Comfortable Ultralight Pack: Gossamer Gear Gorilla 50 ($275)
Frameless Pack with Good Organization: Pa’Lante V2 ($240)
Best Budget Buy: Durston Kakwa 55 ($199)
Best Crossover Pack: REI Flash Air 50 ($299)
What’s New
Comparing ultralight packs to heavy, large-load carrying packs is a bit like comparing apples to oranges, so we decided to give ultralight backpacks their own category. For these packs, we’ve mainly chosen cottage gear companies made by seasoned thru-hikers, with some mainstream budget options mixed in as well.
- The Hyperlite Unbound 40 was a winner among our traditional packs and remains one in our ultralight lineup.
- The Gossamer Gear Mariposa continues to impress with its supremely comfortable build.
- We’ve included frameless packs like the Nashville Pack Cutaway and the Pa’Lante V2 for the most serious ultralight and fast packers.
- Being ultralight doesn’t mean you need to sacrifice weatherproofing. We’ve included some of the most waterproof UL options like the Zpacks Arc Haul Ultra 60, Hyperlite Southwest 55, and Atom Packs The Pulse EP50.
Ultralight Backpacks Overall Testing Scores
Hyperlite Mountain Gear Unbound 40
Best Ultralight Backpack Overall
CleverHiker Rating: 4.9/5.0
Price: $369
Weight: 1 lb. 13.6 oz.
Volume: 40 L
Max Weight Rec.: 40 lbs
Pros
- Waterproof
- Durable
- Good organization
- Stable
Cons
- Thinner padding than others
- Flimsy side straps
The Hyperlite Mountain Gear Unbound 40 is our favorite all-around ultralight pack. It excels in wet weather, carries comfortably even under heavy loads, and offers excellent on-trail functionality.
The pack’s outstanding water resistance comes from its Dyneema Composite Hybrid (DCH) fabric, which inherently resists moisture without relying on a coating or treatment that could wear off over time.
We tested this pack extensively in the Rocky Mountains and Colorado deserts and absolutely drenched it in our water exposure testing. It consistently kept our gear bone dry and provided excellent carrying comfort over high-mileage days.
The pack’s comfort comes from its simple yet effective suspension system, featuring a contoured aluminum stay that effectively transfers weight to the hips. Despite its minimalist design, the Unbound 40 provided a comfortable, stable carry with loads up to 40 pounds. However, the moderately padded straps and plastic sheet back panel may not provide enough cushioning or airflow for some people’s preferences.
The Unbound’s pockets provide excellent efficiency and accessibility. The Dyneema front mesh pocket features two access points, making it easy to grab small items that have sunk to the bottom. The side and hipbelt pockets are spacious and easily accessible on the go, and the innovative bottom pocket with a dedicated trash port is a game-changer.
Although the Hyperlite Unbound 40 comes with a hefty price tag, its water resistance, durable construction, and well-executed design are worth their weight in gold for serious ultralight backpackers. If you frequently venture into wet or harsh environments and demand top-tier performance from your gear, the Unbound 40 is a worthwhile investment that should serve you well for countless miles on the trail.
Atom Packs: The Pulse EP50
Most Versatile Ultralight Backpack
CleverHiker Rating: 4.8/5.0
Price: $290
Weight: 1 lb. 8 oz.
Volume: 50 L (available in 40 L)
Max Weight Rec.: 30 lbs
Pros
- Lightweight
- Good organization
- Water-resistant
- Customizable hip and torso sizing
- Removable carbon hooped frame, foam sleeve, and hipbelt
Cons
- Doesn't carry heavy loads well
- Waist belt is thin
The Atom Packs Pulse EP50 is a thoughtfully designed pack built for thru-hikers by thru-hikers. The Pulse became a favorite of one of our gear analysts after thru-hiking the Colorado Trail with it. They rave about its well-placed and accessible pockets, durability, and water resistance.
The Pulse bridges the gap between frameless packs and large-capacity bearing framed packs. Its lightweight frame provides some rigidity and weight transfer but isn’t meant to carry loads over about 30 pounds.
The minimalist hipbelt also provides less support than some other ultralight packs. However, for loads under that sweet spot, the Pulse EP50 rides with comfort and stability mile after mile. The contoured shoulder straps distribute weight evenly without pressure points, even after long days on trail.
The Pulse EP50 really shines in its well-designed feature set, which prioritizes on-the-go access to essentials. The stretchy shoulder and side pockets reduce the need to take off your pack frequently, allowing you to cover more miles efficiently. The innovative bottom pocket with a trash port is particularly useful.
The Pulse EP50 has top-notch construction quality that balances lightweight performance and durability. The EcoPak EPX200 fabric on the main body is abrasion and tear-resistant. High-use areas are reinforced with 210D Robic Extreema. The pack’s body is DWR-coated and impressively water-resistant. After 500 miles, we’ve seen no wear on the body or the burly Dyneema Mesh front and bottom pockets.
For thru-hikers who appreciate a functional, trail-ready design, the Atom Packs Pulse EP50 delivers a lot of performance and value in an affordable package.
Nashville Pack Cutaway 40L
Best Frameless Ultralight Backpack
CleverHiker Rating: 4.8/5.0
Price: $326
Weight: 1 lb. .5 oz.
Volume: 40 L
Max Weight Rec.: 25 lbs
Pros
- Ultra-ultra lightweight
- Good organization
- Customizable
- Excellent carry for frameless pack
Cons
- Takes some getting used to
The Nashville Pack Cutaway 40 is ideal for dialed-in ultralight backpackers and fast-packers who crush high-mileage days. Its 9 easily accessible exterior pockets and the large wrap-around front pocket store tons of essential gear and snacks, so you almost never have to stop and unshoulder the pack.
The wide and plush vest-like shoulder straps and optional hipbelt offer a rarely achieved comfort level for frameless packs. The Cutaway carries loads up to 25 pounds with surprising stability and comfort, extending its usage to scrambling missions and multi-day food carries.
Adding to its comfort is the pack’s ultra-customizability. Everything from the shoulder strap width to the hipbelt style and all kinds of add-ons allows you to dial in the perfect fit and features for any adventure.
While it’s not the most weather-resistant pack on the market, it is built with durability in mind. The standard EPX70RS fabric is triple-laminated with ripstop on outer and inner surfaces and a DWR coating for additional water resistance. For further durability, Nashville Pack offers the Cutaway in a variety of top-tier fabrics, including Ultra200X.
The Nashville Pack Cutaway is a significant investment in terms of value, but its comfort and exceptional design make it a worthy consideration for dedicated ultralight enthusiasts. If you’re looking for a frameless pack that offers comfort, convenience, and customization options, the Cutaway is a top contender among our favorite ultralight backpacks.
Gossamer Gear Mariposa 60
Most Comfortable Ultralight Backpack
CleverHiker Rating: 4.7/5.0
Price: $315
Weight: 2 lb. 2.2 oz.(medium)
Volume: 60 L
Max Weight Rec.: 35 lbs
Pros
- Comfortable
- Quick closure
- Good organization
- Convenient SitLight pad included
Cons
- Not water-resistant
- Fabric isn't the most durable
The Gossamer Gear Mariposa 60 delivers an impressive balance of comfort, functionality, and lightweight performance, earning it an accolade of the most comfortable ultralight pack we tested.
Our team carried this pack across thousands of miles on the PCT and CDT. It carries exceptionally well, comfortably handling up to 30 pounds without compromising stability or fit. The ultralight build materials held up surprisingly well, only showing wear after thousands of miles.
Central to the Mariposa’s outstanding comfort is its intelligent aluminum frame system, load lifter straps, and ergonomically contoured shoulder straps and hip belt. This strategic design effectively transfers weight to the hips, alleviating strain on the shoulders and upper body during long days on the trail. The pack’s removable foam back panel provides decent ventilation and doubles as a convenient sit pad.
The Mariposa’s well-designed layout streamlines the pockets and organization system, including a generous front stretch pocket, multiple side pockets, and easy-to-use hip belt pockets. The pack’s fold-top closure, a signature Gossamer Gear feature, provides a unique alternative to traditional roll-top designs.
While the Mariposa’s primary materials prioritize weight savings over maximum durability and water resistance, using robust 210D Robic nylon in high-wear areas increases the pack’s overall longevity. For those seeking an ultralight pack that refuses to compromise on comfort and functionality, the Gossamer Gear Mariposa 60 is a compelling option.
ULA Circuit
Best Load Hauling Ultralight Backpack
CleverHiker Rating: 4.7/5.0
Price: $300
Weight: 2 lb. 6.5 oz.
Volume: 68 L
Max Weight Rec.: 35 lbs
Pros
- Excellent hauling capacity for the weight
- Durable
- Carries weight well
Cons
- Too big for some
- Water resistance needs upkeep
The ULA Circuit has long been a favorite among thru-hikers on long trails, and after testing it on varied terrain all over the American West, it’s easy to see why. This pack strikes an impressive balance between comfort, durability, and load capacity, making it one of our favorites for carrying large loads on extended treks.
The Circuit’s robust suspension system is a key factor in its performance. A carbon fiber and Delrin hoop frame, dense foam back panel, and aluminum stay transfer weight efficiently to the hips, ensuring a stable and comfortable carry.
The padded shoulder straps could use a touch more cushioning for heavier loads. Still, the pack’s extensive adjustability and thoughtful material usage—dual hip belt adjusters, load lifters, and breathable mesh—help maintain comfort over long days.
ULA utilizes tried-and-true organization features for functional simplicity. The top strap easily accommodates bulky items like a bear canister. The large side and hipbelt pockets keep water bottles, snacks, and other essentials within easy reach.
The stretchy front mesh pocket is perfect for wet or frequently accessed items, though slightly more capacity here would be nice. The unique wrap-around webbing strap offers extra versatility for attaching oversized gear like snowshoes.
While not fully waterproof, the Circuit effectively resists light rain thanks to its triple-coated 400-denier robic nylon fabric. Under extended exposure, some dampness was noticeable, but no critical leaks were found.
The ULA Circuit is surprisingly durable for such a lightweight pack. In addition to the 400-denier robic nylon, the durable front mesh pocket and heavy-duty webbing ensure the pack holds up to years of use and abuse. Whether tackling a thru-hike or a weekend backcountry trip, the ULA Circuit is a reliable and versatile companion.
More: ULA Circuit Full Review
Hyperlite Mountain Gear Southwest 55
Best Minimalist Ultralight Backpack
CleverHiker Rating: 4.7/5.0
Price: $379
Weight: 1 lb. 15.1 oz.(medium)
Volume: 55 L
Max Weight Rec.: 40 lbs
Pros
- Waterproof
- Durable
- Large pockets
Cons
- Minimalist design might not suit everyone
- Not as padded
The Hyperlite Mountain Gear Southwest 55 is a highly effective ultralight backpack focused on minimalism, weather resistance, and durability. Through extensive field testing across challenging terrain and conditions, we’ve found this pack excels over other ultralight packs that compromise durability for weight savings.
The pack’s Dyneema construction is what makes it stand out. Its inherent water-resistant capabilities virtually eliminate the need for a pack liner and provide longer-lasting resistance than coated fabrics. Different denier ratings (50D/150D in the white version, full 150D in the black) allow you to select your optimal balance of weight savings and durability. Mountaineers, bushwhackers, and scramblers will appreciate the enhanced abrasion resistance of the all-150D black version, while strictly trail trotters will be satisfied with the white version.
Premium materials and construction come at a hefty price point, but we think it’s worth every penny for the right people. This thing is built to last and is a worthy investment for long-distance hikers and anyone demanding top performance.
Hyperlite opts for simplicity when it comes to organization. Some people might appreciate more exterior pockets. Still, an extra 9.8 liters of volume is pretty great for what it has. The pack features two hip belt pockets, two easily reachable side pockets, and one giant front pocket—all made from Dyneema.
Hyperlite packs are typically built with seasoned lightweight backpackers in mind. That said, the relatively thin shoulder straps and the minimal organization system may be a stark change for those used to traditional backpacks.
Zpacks Arc Haul Ultra 60
Lightest Large Capacity Backpack
CleverHiker Rating: 4.7/5.0
Price: $399
Weight: 1 lb. 5.4 oz.
Volume: 60 L
Max Weight Rec.: 30 lbs
Pros
- Lightweight
- Stable
- Durable
- Good back ventilation
- Waterproof
Cons
- Not the softest or most comfy
- Price
The Zpacks Arc Haul Ultra 60 combines innovative design, premium materials, and solid construction for thru-hikers and seasoned ultralighters. Through our field testing in the Rocky Mountains and controlled lab testing, this pack held up beautifully in the elements and provided a stable carry for off-trail scrambling.
One of the Arc Haul Ultra 60’s standout features is its unique suspension system, centered around a curved carbon fiber frame and suspended lycra mesh. This design creates a ventilated air gap between the pack and the wearer’s back, allowing airflow so you can stay cool and dry. The frame efficiently transfers weight to the hips, while the shoulder and hip belts hug the body, creating an extremely stable carry with moderate padding.
The pack’s pockets favor size over quantity. A spacious main compartment with a roll-top closure is complemented by a large mesh front pocket and two easily accessible side pockets. Although hip belts aren’t included, there are additional attachment points for trekking poles, an ice axe, and other gear on the bottom and sides of the pack.
Constructed with 100-denier Ultra fabric, the Arc Haul Ultra offers excellent durability and water resistance. During our testing, the fabric showed almost no wear and kept out virtually all moisture.
While the pack’s minimalist design may not suit everyone, its approach caters perfectly to experienced ultralight backpackers seeking maximum volume with minimal weight. The Arc Haul Ultra isn’t cheap, but it’s worth the investment for dedicated adventurers.
Gossamer Gear Gorilla 50
Well-Priced & Comfortable Ultralight Backpack
CleverHiker Rating: 4.6/5.0
Price: $275
Weight: 1 lb. 15.9 oz.(medium)
Volume: 50 L
Max Weight Rec.: 30 lbs
Pros
- Price
- Stretchy exterior pockets
- Well-padded & comfortable
- Integrated SitLight pad
Cons
- Mesh pocket isn't the most durable
- Unique closure not for everyone
- Not very water-resistant
The Gossamer Gear Gorilla 50 has earned its reputation as a go-to pack for ultralight enthusiasts, and after putting it through its paces on over 600 miles of trail, we understand why. From scrambling through the Spanish Pyrenees to grinding out long days on the PCT, traversing the Olympics, and circling Rainier on the Wonderland Trail, this pack continues to impress us with its ability to balance comfort and weight savings.
At the heart of the Gorilla’s performance is its PVT frame system, which handles loads up to 25 pounds with surprising stability. The hipbelt and shoulder straps deserve a special shoutout. Their breathable mesh and generous padding make long trail days noticeably more pleasant. We did notice some occasional rubbing from the back panel edge during particularly sweaty climbs, but it’s a minor gripe and could be just our personal experience.
What really makes the Gorilla shine are the trail-focused details that show Gossamer Gear’s backpacking experience. The redesigned trekking pole attachments work beautifully. The hipbelt pockets swallow a day’s worth of snacks, and the removable back pad doubles as a welcome lunch seat. Sure, the two-step closure system takes some getting used to, and you’ll need to baby the mesh pocket a bit, but any ultralight pack comes with weight-saving quirks.
For hikers who’ve been thinking about going ultralight but don’t want to sacrifice all their creature comforts, the Gorilla 50 hits a sweet spot. While it might not be our first choice for heavy loads or bush-bashing adventures, it’s become a go-to recommendation for traditional backpacking trips where every ounce counts.
Pa’Lante V2
Best Minimalist Ultralight Backpack
CleverHiker Rating: 4.5/5.0
Price: $240
Weight: 1 lb. 2.7 oz.(medium)
Volume: 37 L
Max Weight Rec.: ~25 lbs
Pros
- Lightweight
- Good organization
- Cool features
Cons
- Big loads strains shoulders
- Small front pocket
The Pa’Lante V2 is one of our favorite frameless backpacks. It is designed for experienced thru-hikers who have dialed in a minimalist kit. Its thoughtful, streamlined design enables high-mileage days with easy access to essential gear.
We tested the V2 extensively in the Rocky Mountains, carrying loads up to 25 pounds. The contoured shoulder straps provide a surprisingly comfortable carry for a frameless pack. However, the V2 does lose some comfort when pushed past about 25 pounds., straining the shoulders without a frame or load lifters to distribute the weight better.
Two of our favorite features are the large shoulder strap pockets that fit everything from snacks to water bottles and the bottom pocket with a handy trash port for stashing wrappers on the go. The stretchy front mesh pocket is on the small side but still very functional.
It’s not a rugged bushwhacking pack, but the V2 is built with durable 210D UHMWPE Gridstop to withstand the constant abuse of thru-hiking. For maximum weather protection, consider upgrading to the Ultraweave 200X version. The Ultraweave is more durable and water-resistant than the gridstop version which showed significant water leakage through the seams.
For sub 12-pound base weight minimalists wanting a smartly-featured, durable pack for cranking out big mile days, the Pa’Lante V2 is tough to beat.
More: Pa’Lante V2 Full Review
Durston Kakwa 55
Best Budget Buy Ultralight Backpack
CleverHiker Rating: 4.4/5.0
Price: $199
Weight: 1 lb. 13.8 oz.(medium in Ultra 200X)
Volume: 55 L
Max Weight Rec.: 45 lbs
Pros
- Durable
- Price
- Good organization
Cons
- Not the most comfy
- Water gets through seams/h20 port
The Durston Kakwa 55 prioritizes rugged durability, functionality, and stability over luxurious comfort. Its rigid frame and minimalist backsheet sacrifice some comfort compared to other packs but ensure a stable and consistent carry.
We think Durston’s estimate of 45 pounds as a max load is a little ambitious, but we experienced solid performance from the aluminum tubing frame even up to 35 pounds. It’s still an impressive weight, and most ultralighters rarely approach a 45-pound pack weight.
Constructed with Ultra 200X fabric, a high-tenacity blend of UHMWPE fibers, this pack offers outstanding resistance to abrasion and punctures. We put the Kakwa to the test, bushwhacking through dense brush and scrambling over jagged rocks, and it showed with minimal wear.
Its reinforced stress points and bound seams further enhance its structural integrity and ability to handle heavy loads. The pack is also available in a slightly less durable but more affordable and lightweight UltraGrid version.
The feature set is clearly trail-tested and designed by seasoned backpackers. The pack has ample storage capacity and intelligently placed pockets, including the innovative side zipper pocket, generous hip belt pockets, and elastic shoulder strap pockets. Each is designed to enhance efficiency and provide easy access to essential gear.
Although the Kakwa 55 features a durable laminated waterproof backing, our testing revealed some vulnerability to moisture intrusion through the hydration port and seams. Despite this drawback, the pack’s highly water-resistant materials and construction still provide a significant level of protection compared to many other ultralight options on the market.
Durston famously produces quality, well-designed, and durable products at an impressively affordable price point, and the Kakwa is no exception.
REI Flash Air 50
Best Crossover Backpack
CleverHiker Rating: 4.4/5.0
Price: $299
Weight: 1 lb. 14 oz.(medium)
Volume: 50 L
Max Weight Rec.: 25 lbs
Pros
- Lightweight
- Accessible side pockets
- Good intro to ultralight
- Men's/Women's specific
Cons
- Top and side straps not durable
- Hipbelt is uncomfortable for some
The REI Flash Air 50 offers an excellent blend of traditional comfort and ultralight mentality, making it an ideal choice for hikers transitioning into ultralight backpacking. The pack’s robust suspension system, consisting of a stiff internal frame, supportive hipbelt, and generously padded back panel with air channels, provides race-car-seat-like comfort reminiscent of heavier traditional backpacks.
Despite its focus on support and comfort, the Flash Air 50 manages a streamlined, weight-conscious design. The lightweight nylon construction, with a reinforced 210D nylon bottom panel, is lightweight and moderately durable. The seven exterior pockets include a medium-sized, cinchable front pocket, two tall side pockets, and two ultra-accessible water bottle side pockets. The two hipbelt pockets provide extra storage for regularly need gear items.
During our field testing, we were impressed by the Flash Air 50’s load-hauling capabilities, comfortably handling weights up to 30 pounds. The pack’s DWR coating demonstrated impressive water resistance, although we recommend using a pack liner for long-term waterproofing as the coating may wear off over time.
While the Flash Air 50 may not be the lightest or most durable option in the ultralight category, its exceptional comfort and practical features make it a top choice for backpackers seeking a balance between the support feel of a traditional pack and a minimalist ultralight design. REI has successfully bridged the gap between these two styles.
Product Comparison Table
| oSort | Product | Price | Weight | Volume | Max Weight Rec. | Comfort | Functionality | Water Resistance | Construction | 0 |
Hyperlite Mountain Gear Unbound 40 View at HMG View at Garage Grown Gear 
|
$369 | 1 lb. 13.6 oz. | 40 L | 40 lbs | 4.7 | 4.7 | 4.9 | 4.9 | 1 |
Atom Packs: The Pulse EP50 View at Atom Packs
|
$290 | 1 lb. 8 oz. | 50 L (available in 40 L) | 30 lbs | 4.6 | 4.8 | 4.8 | 4.8 | 2 |
Nashville Pack Cutaway 40L View at Garage Grown Gear View at Nashville Pack |
$326 | 1 lb. .5 oz. | 40 L | 25 lbs | 4.8 | 4.8 | 4.7 | 4.5 | 3 |
Gossamer Gear Mariposa 60 View at Gossamer Gear View at Garage Grown Gear
|
$315 | 2 lb. 2.2 oz. (medium) | 60 L | 35 lbs | 4.9 | 4.8 | 4.3 | 4.6 | 4 |
ULA Circuit View at ULA |
$300 | 2 lb. 6.5 oz. | 68 L | 35 lbs | 4.7 | 4.7 | 4.7 | 4.8 | 5 |
Hyperlite Mountain Gear Southwest 55 View at REI View at HMG |
$379 | 1 lb. 15.1 oz. (medium) | 55 L | 40 lbs | 4.6 | 4.7 | 4.9 | 4.8 | 6 |
Zpacks Arc Haul Ultra 60 View at Zpacks |
$399 | 1 lb. 5.4 oz. | 60 L | 30 lbs | 4.5 | 4.6 | 5.0 | 4.9 | 7 |
Gossamer Gear Gorilla 50 View at Gossamer Gear View at Garage Grown Gear 
|
$275 | 1 lb. 15.9 oz. (medium) | 50 L | 30 lbs | 4.8 | 4.7 | 4.3 | 4.6 | 8 |
Pa’Lante V2 View at Garage Grown Gear View at Pa'Lante Packs |
$240 | 1 lb. 2.7 oz. (medium) | 37 L | ~25 lbs | 4.5 | 4.6 | 4.5 | 4.6 | 9 |
Durston Kakwa 55 View at Durston
|
$199 | 1 lb. 13.8 oz. (medium in Ultra 200X) | 55 L | 45 lbs | 4.3 | 4.7 | 4.4 | 4.8 | 10 |
REI Flash Air 50 View Men's View Women's |
$299 | 1 lb. 14 oz. (medium) | 50 L | 25 lbs | 4.6 | 4.7 | 4.7 | 4.3 |
|---|
How We Test & Methodology
COMFORT
Comfort is the one factor that, above all else, will cause you to change packs. Lack of convenience or water resistance can be handled, but pack-induced pain can ruin a trip. To determine the comfort of a pack, we hiked several miles in the Rocky Mountains, each packed to its maximum recommended load. We considered things like weight transfer, stability on uneven terrain, padding, airflow, and adjustability.
Comfort is subjective, however, and what works for us might not work for you. Some people feel more comfortable without a frame or hipbelt and others associate comfort with stability. So be sure to always consider your own experience and hiking style.
FUNCTIONALITY
This is the fun stuff. If you were to design your dream backpack to be the most streamlined, easy-to-use system with all the pockets in the right place and with innovative organization features that you find yourself wanting when you wear your current pack (all in the most lightweight way possible), what would it look like? This is essentially how most of these packs were conceived: by wearing the wrong packs and wishing these ones into a reality.
We took stock of each pocket, strap, feature, and anything else that contributes to the pack’s efficiency and put them to the test. We got out on the trail and closely analyzed the effectiveness of each feature in the real world. We tested the pockets for ease of use, reachability, and size. We then boiled all this down into a score of the pack’s overall functionality.
WATER RESISTANCE
Some products provide a water resistance rating based on the pressure needed to permeate a fabric, but we think the best way to determine water resistance is to go hands-on.
So we stuffed a dry pillow into each pack, closed it up tight, and then tossed it in the shower. We left each pack under a torrential downpour for several minutes, being sure to sufficiently drench every side before removing the pillow and assessing the damage.
Some packs leaked in noticeable places along the seams, others had moisture throughout due to the non-resistant fabric, and some were even virtually waterproof. There are different types of waterproofing, which also must be taken into account to determine the pack’s long-term protection.
CONSTRUCTION
Construction refers to weight, abrasion and tear resistance, stitching, and anything else that can contribute to the pack’s life.
The durability of a pack can only be truly determined by lots of trail time. Luckily, we are a team of thru-hikers, runners, and experienced backcountry travelers, so we get a lot of trail time. Our gear analysts have hundreds or thousands of miles of experience with many of the packs on the list.
Overall durability can also be quantified down to stitching, materials, fabric weight, and more. Durability usually comes at the sacrifice of weight savings, so it’s particularly impressive when a pack achieves a good weight-to-capacity ratio.
Why Trust CleverHiker
Our team of experts have shouldered these packs over 20,000 across trails all over the world. We’ve pulled on the straps and reached in and out of every pocket countless times. Gear analyst Brett Kretzer has thru-hiked over 2000 miles on the Colorado Trail, Wonderland Trail, GR11, and Long Trail.
From his time on trail with a variety of different packs on varied terrain, he has become intimately familiar with what works and what doesn’t. As an experienced gear expert and backpacker, he has an eye for detail paired with a trail-ready mentality.
Analysis & Results
Here, we nerd out on ultralight backpacks to explain how and why these packs earned a spot on our best-of list.
VALUE
Value looks a little different for everyone when it comes to most gear choices. Some will value materials and comfort over the most innovative features. Fast-packers who want to travel fast and light may value weight and accessible pockets above all else. We’ve done our best to give each pack a fair overall rating on a 5-point scale in order to level the playing field.
The Hyperlite Mountain Gear Unbound 40 stands out as providing the most value across all metrics. Its superior weather resistance, durability, streamlined feature set, and ability to carry weight make it an incredibly well-rounded pack that justifies the price.
The Atom Packs The Pulse EP50, with a slightly lower score, offers the best bang for your buck. It scores highly in every metric, especially functionality, and is available at a very affordable price point.
The ULA Circuit and Gossamer Gear Mariposa 60 also provide a lot of value for the money due to their comfort and capability of handling larger loads. Both are extremely popular packs on the Pacific Crest Trail and Appalachian Trail which is telling.
Closely behind them unsurprisingly is the Gossamer Gear Gorilla 50. Gossamer Gear has been delivering quality packs at reasonable prices for decades and the Gorilla is no exception.
Durston is another company that regularly cranks out intelligently engineered outdoor gear at staggeringly affordable prices. While the Durston Kakwa 55 has a few kinks to work out, it still offers a ton of value for an ultralight beginner or a seasoned thru-hiker.
COMFORT
A pack’s comfort (or lack thereof) is the biggest determining factor for your wearing pleasure. Backpacking is already a grind, so a comfortable pack is paramount.
Comfort comes in many forms, but overall, we found the Gossamer Gear Mariposa 60 to be the most comfortable. Its generously padded shoulder straps and hip belt work with the lightweight frame to transfer weight and provide a comfortable, stable ride.
Closely behind the Mariposa are its slightly boxier sibling, the Gossamer Gear Gorilla 50, and the frameless Nashville Pack Cutaway. We weren’t shocked to see another Gossamer Gear pack this high on the list, but a frameless pack surprised us. With the wide, plush shoulder straps and the optional supportive hipbelt, the Cutaway carries incredibly comfortably, without straining the shoulders, and delivers excellent stability on technical scrambles.
From there, we move into a different comfort style with the Hyperlite Mountain Gear Unbound 40 and Southwest 55. Hyperlite packs opt for simplicity as their comfort strategy…and it works. With no abrasive or potentially irritating fabrics to create pack rash, the plastic pack glides freely over the wearer’s back. Despite their lack of load lifters or heavily padded straps, Hyperlite manages to create framed packs that carry weight incredibly well.
The ULA Circuit is one of the best UL pack horses out there. Although it’s not stacked with as much luxury as other packs, the Circuit has an ambitious capacity of 68 liters, which it carries remarkably well. There’s a reason that it is one of the most popular packs on the Pacific Crest Trail.
Another pack to note for its uniqueness amongst our favorites is the REI Flash Air 50. The Flash Air successfully bridges the gap between traditional backpacks and ultralight backpacks. From the front, the pack shows off its ultralight construction and organization mentality. When you turn it around, you find a heavily engineered back panel and hip belt that looks a bit racecar-esque. We included this pack on our list because many folks want to go ultralight but love a traditional backpack’s solid, supportive feel.
While all of the packs we tested are comfortable for multi-day use, some of them simply prioritize other factors. The Atom Packs The Pulse EP50 is a very comfortable pack, but it shines more in functionality, durability, and water resistance. The Zpacks Arc Haul Ultra 60 and the Durston Kakwa 55 are both built like tanks and derive their comfort from a rigid, close-to-body feel. The Pa’Lante V2 is a minimalist pack that lacks a frame and heavy padding, but strategic packing could make its comfort stand out.
FUNCTIONALITY
Functionality is what it feels like to put a pack into real, practical use. Does everything work as it’s supposed to, and do the features noticeably enhance your overall experience on-trail?
The most versatile pack we tested is the Atom Packs The Pulse EP50. It’s ability to be used as a minimal frameless pack or supportive framed pack extends its usage to the most ultralight backpackers to ultralight beginners. The features are well thought out for multi-faceted adventures with several reachable pockets, lots of shock cord, an ice axe loop, and other unique inventions.
For fast-packers who can’t stand to stop and take off their pack, the Nashville Pack Cutaway stands out for its on-trail efficiency. It’s a frameless pack, which encourages the wearer to keep their load light, and is built like a running vest. It also has a whopping 9 reachable pockets while wearing the pack to ensure that everything you’ll need throughout the day is within arm’s reach.
The Mariposa 60 and Gorilla 50 by Gossamer Gear stand out for their innovative designs. The fold-top enclosure, sit pad back panel, and style of trekking pole attachment are all exclusive to Gossamer Gear packs in this guide. While the fold-top isn’t for everyone, some people consider it a game change in terms of functionality. We also appreciate the side pocket configuration on the Mariposa, which includes a tall pocket for tents and two regular-size ones stacked on top of one another.
Other unique features include the REI Flash Air 50’s ultra-accessible water bottle holsters, the Durston Kakwa 55’s waterproof side zipper pocket, and the Pa’Lante V2’s designated tent stake pocket.
Some functionality standouts are due to their impressive attention to detail and innovative designs. That doesn’t mean the Hyperlite Mountain Gear Unbound 40 and Southwest 55, Zpacks Arc Haul Ultra 60, and the ULA Circuit don’t function well. These are all high-functioning packs; it just depends on the user’s preferences.
WATER RESISTANCE
For some, water resistance is a deal breaker, but others would prefer to save the weight or use a pack liner/cover. Either way, it varies significantly based on material, seam construction, and waterproof type.
The Zpacks Arc Haul Ultra 60 came out on top due to its use of highly water-resistant Ultra fabric and a laminated waterproof backing, which creates a physical moisture barrier instead of a chemical one. During our extensive water exposure testing, virtually zero signs of moisture penetration were observed inside the pack.
The Hyperlite Unbound 40 and Southwest 55 also displayed promising test results, with no moisture entering the pack. However, these packs’ water resistance is due to the highly resistant Dyneema Composite Hybrid fabric. The Unbound 40, in particular, also has reinforced and taped webbing-backed seams. Theoretically, these packs could become more permeable over time, but we have yet to see a major issue after extended use.
The Atom Packs The Pulse EP50 uses water-resistant EcoPak EPX200 fabric and a Durable Water Repellent finish, but it lacks taped seams. It kept our gear dry for the most part, but moisture can leak through the seams.
Packs like the Nashville Pack Cutaway, REI Flash Air 50, and ULA Circuit demonstrated impressive water resistance for using non-resistant fabrics. All of them are treated with a waterproof coating (the ULA Circuit even has three passes of two different coatings). Even the REI Flash Air performed as well as some of the best packs initially. However, waterproof coatings wear off over time and must eventually be reapplied. In our experience, reapplication is never quite as good as the factory treatment, thus landing them lower on the list.
The Durston Kakwa 55 is theoretically extremely water-resistant due to its laminated waterproof backing, but we noticed significant leakage during our testing, most likely coming from the hydration port. This pack will most likely keep your gear safe if you stay mindful of weather exposure, but we still recommend using it with a pack liner.
The remainder of the packs, Gossamer Gear Mariposa 60, Gorilla 50, and Pa’Lante V2 are minimally water-resistant and absolutely require the use of a pack liner. However, this is a feature, not a flaw. These companies simply prioritized comfortable fabric and maximum weight savings over weather resistance.
CONSTRUCTION
Overall construction is a metric comprising several assessments, including weight-to-capacity ratio, seam construction, and abrasion resistance. The packs that stood out above all others in this category are the Zpacks Arc Haul Ultra 60 and the Hyperlite Mountain Gear Unbound 40.
The Arc Haul is incredibly lightweight for its durability, weighing only 0.4 ounces per liter of capacity. The use of high-end Ultra 100X material allows it to achieve this amazingly lightweight durability. A carbon fiber frame, minimal straps, and lightweight mesh further increase the strength-to-weight ratio.
The Hyperlite Unbound 40 and Southwest 55 are durable packs due to the DCH fabric, which can be 15 times stronger per ounce than steel! However, the Unbound 40 kicks it up a notch with Dyneema mesh outer pockets and robustly reinforced seams.
Other remarkably well-constructed packs are the ULA Circuit and Durston Kakwa 55. The Circuit uses a super thick 400-denier robic nylon throughout the pack. Nylon is not as inherently abrasion-resistant as DCF, DCH, or Ultra, but 400-denier is about as strong as it gets for backpacks. Speaking of Ultra, the Durston Kakwa 55 uses Ultra 200X, double stitched with heavyweight thread and folded seams.
The Gossamer Gear Mariposa 60 and Gorilla 50, Nashville Pack Cutaway, and the Pa’Lante V2 are solidly built packs that also focus on comfortable materials and flowy, lightweight construction. The Mariposa and Gorilla are made from satisfyingly soft nylon, requiring much more care than Dyneema or Ultra. We found that the mesh front pocket is particularly vulnerable.
We have one little gripe with the REI Flash Air 50. The exterior straps are much thinner than they need to be, and that gives us some worry. We recommend keeping this pack on the well-beaten path.
How to Choose an Ultralight Backpack
FIRST, LET’S TALK BASE WEIGHT
The right pack depends on your trails, hiking seasons, and distances between food and water resupply points.
Ultralight backpacks (weighing less than three pounds) work best for hikers who have already dialed in their gear to a low base weight of 10-12 pounds (all your gear minus food, water, and fuel). This base weight is pretty stripped down and utilizes ultralight gear, apparel, and techniques.
Then there are uber-ultralight backpackers and fast packers. Their base weight hovers around ~5 pounds. This is usually made possible by going tentless and stoveless, swapping the bag for a quilt, warmer temps, and generally reserving all creature comforts for resupply stops. This style is not for the faint of heart, but they are certainly covering some ground, and a minimalist ultralight pack will serve them well.
If your base weight is heavier than that (12-20 pounds), we recommend finding a lightweight backpack with a higher recommended max weight load. This will ensure that you can carry heavier loads with adequate structural support and suspension.
Overloaded ultralight packs can feel worse than heavier packs because sometimes they lack features like load-lifters, burly hipbelts, frames, or ample shoulder padding to help support and distribute the weight. So we recommend finding out your base weight, calculating volume and weight of your biggest food/water carries, and then shopping accordingly.
FRAME OR NO FRAME
If you’re considering a frameless pack, you’ve probably already tried out several framed packs and have gotten your ultralight base weight dialed in. We generally recommend framed packs for anyone with a base weight over twelve pounds.
A frame transfers some of the weight to your hips so you can experience a more stable, balanced carry and take some strain off of your shoulders. The addition of load lifters will bring the back closer to your body, further stabilizing the load.
A frameless pack will force all of the weight on your shoulders which can get uncomfortable unless your pack weight is very light. Many ultralight backpackers who cover lots of miles enjoy the freer feel of a frameless pack.
CAPACITY
This is simply how much gear a pack can carry, measured in liters. Capacity should be decided by what your kit looks like, not what you want it to look like. Think about how much space it takes up and if you have any long food or water carries on an upcoming trip. 50 to 60 liters is the sweet spot for most people.
FEATURES
In our opinion, a pack’s features are what makes it feel like your own. Manufacturers are constantly brainstorming for new innovative ideas that enhance the overall usability of the pack.
Close your eyes and imagine yourself on the trail – hiking, snacking, hydrating, navigating, doing camp chores, packing, and unpacking. Are there any features that you consider crucial to your hiking style?
A few to think about are hipbelt pockets, a bottom pocket, shoulder strap pockets, enclosure type, side straps, adjustability/customizability, and an ice axe loop.
WATER RESISTANCE
Some people consider water resistance a crucial feature in protecting their gear and love the piece of mind, while others prefer the weight savings of non-water-resistant fabric, knowing that they will use a pack liner (or cover, but UL hikers tend to go with a liner) anyway. There are three main types of waterproofing:
- Waterproof coating – Durable Waterproof Repellent (DWR) or a polyurethane coating (PU). Both wear off over time and eventually need reapplied.
- Laminated backing – a physical barrier and the best, most permanent type of waterproofing.
- Water-resistant material – DCF and Ultra have an extremely high water resistance rating, which can seem totally waterproof at first, but are prone to increased permeability over time and extended exposure.
DURABILITY
The nature of the adventure often determines the demand for durability. Are you planning on squeezing your pack through the tight limestone tunnels of the Mahoosuc Notch, or will you stick to wide-open trails in the alpine? Whatever the case, it’s tough to get a feel for a pack’s durability without putting it to the test, but we can learn a lot from the materials used.
Ultra and Dyneema fabrics are popular right now because they are stronger than steel. However, Robic and Ripstop Dyneema are still commonly trusted as well. Many fabrics will have a denier count. The higher the denier count, the more abrasion and tear-resistant the fabric. You’ll often see this written as 200D or 100D.
Finally, your own nature should influence how durable your pack needs to be. If you tend to trash your gear, drop your pack like a hot pot when it’s time to take it off, or trip/slip a lot, go for a pack that uses a durable fabric and rugged zippers/buckles.
PADDING
More experienced backpackers often prefer a more minimalist suspension system with less padding. It can offer significant weight savings and avoid potential pack rash from foam and mesh. However, if you are used to a more traditional style backpack and know that you like a supportive feel, you might seek a pack with ample padding on the back, hips, and shoulders.
Conclusion
There are many factors to consider when choosing an ultralight backpack. Whether you value comfort, durability, something fast and light, or just have to have shoulder strap pockets, it’s up to you to decide which features will best facilitate your hiking style. We hope our expertise has helped narrow it down to your ideal hiking companion!
For weekend trips or adventures where you need more capacity and burlier suspension, take a look at our list of the best backpacking backpacks.
