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The Best Ultralight Backpacks for 2017

We hiked high and low  from the Continental Divide to the Appalachian Trail  to find the best ultralight backpacks! Here  our lead tester  Brandon  celebrates another beautiful day in Rocky Mountain National Park with the Osprey Exos 48  our Best Buy winner.
By Brandon Lampley ⋅ Review Editor
Wednesday
For extended trips, light is right. But which ultralight backpack will satisfy your needs? We researched the market and tested the best 8 models for several months to find your ideal pack match. From the Colorado Trail and the summits of 14ers, to a 250-mile stint on the Appalachian Trail, we wore these products, assessing which ones are light but still comfortable, have useful features, and can support heavy loads for many miles. In addition to hundreds of days testing in the wilderness, we sought feedback from experienced thru-hikers and performed a significant amount of lab testing. Whether you're gearing up for a six-month thru-hike or fine-tuning your kit for ultralight weekend backpacking, we've got you covered.

Updated April 2017
For spring and summer ultralight go-getters, we updated this review to provide the best analysis and selection of ultralight packs. We added details on some minor updates to two award-winning packs, one each from Gear Gorilla and ZPacks. We expect both modifications to improve their performance. Full comparisons of the older and latest models of these packs are found in their respective individual reviews. To highlight comparative differences in performance between all tested models, we added tables and charts in the metrics.

Best Overall Ultralight Backpack


Gossamer Gear Gorilla


Gossamer Gear Gorilla Updated
Editors' Choice Award

$245 List
List Price
See It

Lightweight
Carries light and medium loads well
Adaptable
Perfect feature set
More durable than most
A little small for a bear canister
The packs in this review all excel in at least some way, but the Gossamer Gear Gorilla proved to be an uber-performer across the board. It remains comfortable and high-functioning whether loaded light or up to 30 pounds and provides excellent adaptability and durability for an ultralight pack. It has the right pockets in the all right places, and the removable aluminum frame is burly yet light. The Gorilla is our favorite for all our lightweight backpacking and thru-hiking adventures, hands-down. Gossamer confirmed with us that they updated this pack since we reviewed it, redesigning the hip belt and aluminum frame. More details on the updates are in the individual review.

Read full review: Gossamer Gear Gorilla

Best Bang for the Buck


Osprey Exos 48


Best Buy Award

$142.38
at Amazon
See It

Perfect for medium loads
Relatively inexpensive
Most complete set of features
Many external storage and lashing options
Relatively heavy
Not as durable as others
The Osprey Exos 48 is the most affordable pack in this review that landed among our top five scoring products. It carries very light loads reasonably well, has the most refined and utilitarian set of features, and truly delivers when you want to carry overall loads of 20 pounds or more. Anytime we headed out carrying 30 pounds or a little more, it was difficult to not choose the Exos… it just carries relatively heavy loads better than others over long miles. As an added benefit, this Osprey pack is widely available from online sources and bricks and mortar retailers, which isn't the case with our other two award winners. If you want to buy a pack today and head out on a lightweight backpacking adventure next weekend, the Exos 48 is your best bet.

Read full review: Osprey Exos 48

Top Pick for Ultralight Enthusiasts


ZPacks Arc Blast 55


ZPacks Arc Blast 55
Top Pick Award

$325 List
List Price
See It

Lightest pack with a frame
Practically waterproof
Good external storage
Very light!
No hip belt pockets (available add-on)
Complicated frame
The ZPacks Arc Blast 55 is the lightest backpack we tested that can comfortably carry 20 to 30 pounds when you need it to, but really excels when carrying 10 to 20 pounds. Weighing 21 ounces, it is a half pound lighter than any of the other top scoring packs in this review. Built with a hybrid Cuben fiber material and carbon frame components, this is the pack several of our thru-hikers testers chose for multi-month hikes when every ounce matters. If you are an experienced ultralight hiker seeking to spare another half pound or more from your Big Four base weight, the Arc Blast receives our highest recommendation. This ZPacks has received some minor updates since our review was published, including changes to the volume (more of it), frame, and belt, sternum, and top strap buckles. Its name is now the Arc Blast 55, formally known as the Arc Blast 52. We have detailed these changes in the individual review of this product.

Read full review: ZPacks Arc Blast 55

Honorable Mention for Multi-day Trail Running


Ultimate Direction Fastpack 30



$98.97
at Backcountry
See It

Designed for running
Comfortable vest-like suspension
Excellent on-the-go access
Small volume
No waist belt
Heavy frame sheet
The Ultimate Direction Fastpack 30 is the smallest pack we tested in this review, and the only purposely designed for multi-day trail running adventures. We carried up to 15 lbs in it during a two-day trip and stayed relatively comfortable. If you want an ultralight running pack with capacity for multi-day trips, it is perfect.

Read full review: Ultimate Direction Fastpack 30

up to 5 products
Score Product Price Total Weight Stripped Weight Claimed Volume
85
Gossamer Gear Gorilla $245
Editors' Choice Award
29.4 oz 17.5 oz 38 L
77
ULA Ohm 2.0 $210
31.4 oz 20.4 oz 63 L
77
Osprey Exos 48 $190
Best Buy Award
37.6 oz 33.9 oz 48 L
75
ZPacks Arc Blast 55 $325
Top Pick Award
21.3 oz 21.3 oz 52 L
67
Hyperlite Mountain Gear Windrider 3400 $340
32 oz 27.7 oz 55 L
64
Granite Gear Virga 2 $140
18.6 oz 18.6 oz 54 L
60
Mammut Creon Light 45 $160
38.7 oz 35.5 oz 45 L
53
Ultimate Direction Fastpack 30 $180
25.9 oz 18.6 oz 30 L

Analysis and Test Results


The eight backpacks we evaluate here include the best and most versatile packs for lightweight and ultralight three-season backpacking, as well as a couple more specialized models for specific uses. The five highest scoring models are all great choices for thru-hiking trips that last for months and shorter trips as well. Expert backpackers will also find these packs just large enough for wintertime adventures. Read on to learn more about how we scored the packs across the test metrics and to find the top performers in each one. The rating table above shows where each ultralight pack in our review ranked in the cumulative score.

The Gossamer Gear Gorilla packed with equipment  food  and fuel for a five-day wintertime section of the Appalachian Trail. We covered a lot of miles to find the best ultralight backpacks. From the packing tests seen here  to the independent weight and volume measurements in our lab  we've done the most thorough side-by-side testing for you.
The Gossamer Gear Gorilla packed with equipment, food, and fuel for a five-day wintertime section of the Appalachian Trail. We covered a lot of miles to find the best ultralight backpacks. From the packing tests seen here, to the independent weight and volume measurements in our lab, we've done the most thorough side-by-side testing for you.

Weight-to-Volume Ratio


Weight-to-volume ratio is a measure we use here at OutdoorGearLab to compare packs and luggage of differing volumes. This metric gets straight to the point…how much does this pack weigh relative to the volume it carries. Two sets of data, generated by our lab measurements, comprise this metric. First, we measured the weight of each model on our digital scale. First, we weighed each pack with all modular components in place. Next, we examined each for frame, waist belt, or other pockets that can be easily removed to pare the weight down for light loads; we then stripped these features off each pack and weighed them again.


The most detailed lab testing with these products was our independent measurement of pack volume - since nominal volume measurements from manufacturers are difficult to compare, we decided to perform our own test. Although an ASTM standard exists for measuring pack volume and many pack manufacturers perform ASTM testing, some report the volume of only the main pack as the nominal measurement, while others include pockets. The ASTM test doesn't provide for measuring external pocket volume, which is significant on these packs. In our tests, we measured the volume of the main pack, the main exterior pockets, and the lid (when present).

After we filled the main compartment of each pack with ping pong balls to measure volume  we then measured the volume of external pockets and lids. We found all the top performing packs have similar total volume measurements.
After we filled the main compartment of each pack with ping pong balls to measure volume, we then measured the volume of external pockets and lids. We found all the top performing packs have similar total volume measurements.

To provide an example, the Gossamer Gear Gorilla is described nominally as a 38-liter pack and the ZPacks Arc Blast as 55 liters. However, we found these two packs nearly identical in volume, both when performing our laboratory volume testing with ping pong balls and when packing in the exact same kit for a five-day wintertime trip on the Appalachian Trail.

Weight-to-Volume Ratio is the largest contributor to total scores at 35%. The Granite Gear Virga 2 and ZPacks Arc Blast earned the best scores. These are the two lightest packs we tested and forgo many of the features common on other models. Neither has hip belt pockets and the Virga doesn't have any sort of frame. Thanks to its stand-out weight-to-volume ratio (and its carrying comfort), the Arc Blast won our Top Pick Award for Ultralight Enthusiasts.

The Gossamer Gear Gorilla and ULA Ohm 2.0 earned the next best scores for weight-to-volume ratio. Both measured just better than the middle of the field with all their modular components in use and both were top performers when we compared "Stripped Weight" to "Stripped Volume." Unlike the two minimalist packs above, both of these are fully-featured with hip belt pockets and can carry heavier loads in more comfort.

The results of our laboratory measurements of weight-to-volume ratio. The two highest scoring models forgo features that we love like hip belt pockets (though they are available as modular add-ons). The Editors' Choice winning Gorilla and Top Pick winning Arc Blast have the best average weight-to-volume ratios after the frameless Virga 2.
The results of our laboratory measurements of weight-to-volume ratio. The two highest scoring models forgo features that we love like hip belt pockets (though they are available as modular add-ons). The Editors' Choice winning Gorilla and Top Pick winning Arc Blast have the best average weight-to-volume ratios after the frameless Virga 2.

Carrying Comfort


Of course we all want an ultralight pack to be feather light, but it must carry our load comfortably to be worth it. For each of these packs, we judged load carrying comfort for two loads: 15 lbs and 30 lbs. We then averaged each pack's performance in both categories to generate our carrying comfort score. Fifteen pounds is a perfect comparison weight for ultralight hikers on a short trip and thirty pounds is a fair comparison weight for lightweight hikers on shorter trips or ultralight hikers carrying a week's food or traveling in the winter. While some packs can be stripped of their frame and waist belt, our evaluation of "Great, Good, or Poor" for carrying 15 lbs and 30 lbs is with the frame and waist belt in use. We feel you'd want to strip down a pack completely for carrying 12 lbs or less total weight.


Only two of the ultralight backpacks we evaluated earned our "Great" score for carrying both 15 and 30 lbs: the Gossamer Gear Gorilla and the ULA Ohm 2.0; as a result, these packs earned our highest overall scores. In addition, these two packs are the easiest to strip of frame and waist belt if and when you want to carry 12 lbs or less. At this low weight, we feel frames and even waist belts provide little benefit.

Nearly every day out with these packs  we put them on the scale before hiking  noting how well each carries 15 or 30 pounds (and the loads in between). At the end of our testing period  we also loaded each pack with 30 pounds  and hiked the same hill up and down to confirm our field testing.
Nearly every day out with these packs, we put them on the scale before hiking, noting how well each carries 15 or 30 pounds (and the loads in between). At the end of our testing period, we also loaded each pack with 30 pounds, and hiked the same hill up and down to confirm our field testing.

Also notable in this metric are the next highest scorers. The Osprey Exos 48 carries 30 pounds more comfortably than any other we tested, but we found the tensioned frame a bit "turtle shell-like" for much lighter loads. The Arc Blast 55 also earned a high score. It carries 15 to 25 lbs as comfortably as any other pack, but we found 30 lbs a bit too much.

To simplify our findings for load carrying comfort even further, we feel each of our three award winners fits a good niche as far as load carrying comfort goes:
  • Best for 10-20 lb loads: Top Pick for Ultralight Enthusiasts: ZPacks Arc Blast 55
  • Best for 15-25 lb loads: Editors' Choice: Gossamer Gear Gorilla
  • Best for 20-35 lb loads: Best Buy: Oprey Exos 48

Looking towards Wyoming from near Rabbit Ears Pass on the Continental Divide. With this pack's very affordable price  we wanted to be able to recommend it to backpackers on a very tight budget. Unfortunately  it just doesn't deliver the performance necessary.
Looking towards Wyoming from near Rabbit Ears Pass on the Continental Divide. With this pack's very affordable price, we wanted to be able to recommend it to backpackers on a very tight budget. Unfortunately, it just doesn't deliver the performance necessary.

Features


Manufacturers constantly seek to find the right balance of features for ultralight backpacks. Eliminating most creates a very light pack, but including the right ones can greatly increase comfort, versatility, and ease of use. The lightest two packs we tested, the Arc Blast and Virga 2, both earned top scores in our weight-to-volume ratio metric, but their total scores reflect the trade-offs required to be the lightest: reduced load carrying comfort at heavier weights and reduced ease of use as a direct consequence of eliminating features.


In our individual reviews, we provide a thorough description of each pack's features not covered elsewhere. When covering big miles on the trail, features like easily accessible side pockets for your water bottles, waist belt pockets for snacks, and a convenient place to keep maps handy are a huge benefit. This is also where we detail how each pack accommodates a hydration bladder and just how much stuff you can stow in the exterior pockets.

The Osprey Exos 48 incorporates so many features, it's really head and shoulders above the rest. While most manufacturers pick and choose which features they think are the most useful, Osprey provides nearly every storage, lashing, and compression feature you can imagine. This is super convenient but contributes to the pack's relatively heavier weight. The Gossamer Gear Gorilla and the ULA Ohm 2.0 earned the next highest scores for features. We think they include the most useful ones. The primary differentiating feature is the large and very stretchy exterior pocket on the Gorilla. We love how much you can stuff in there compared to the small volume of the Ohm's exterior pocket.

The Osprey Exos 48 is the most featured pack of this bunch. 2:1 waist belt adjustment  waist belt and shoulder strap stow pockets  extensive use of compression and lashing straps  hydration pockets and ports...the list goes on and on. While this is the second heaviest pack we tested  it has the broadest and most utilitarian set of features. Seen here in the shoulder strap pockets are sunscreen and water treatment drops...super convenient.
The Osprey Exos 48 is the most featured pack of this bunch. 2:1 waist belt adjustment, waist belt and shoulder strap stow pockets, extensive use of compression and lashing straps, hydration pockets and ports...the list goes on and on. While this is the second heaviest pack we tested, it has the broadest and most utilitarian set of features. Seen here in the shoulder strap pockets are sunscreen and water treatment drops...super convenient.

Adaptability


While our carrying comfort metric is focused on how well each pack can carry either 15 or 30 pounds in its full configuration, our adaptability metric focuses on other considerations when you may want to scale your pack up or down in carrying capacity. While on a thru-hike or a week-long adventure in the backcountry, your total bulk and weight will fluctuate up and down between re-supplies and for weekend trips sometimes you'll need to carry a substantial load, but other times you may carry very little. A pack whose design allows the frame and waist belt to be easily removed for very light loads is more adaptable. While many of our testers have several packs suited for varying loads, a highly adaptable pack is awesome when you seek one pack to do it all. The Gorilla and the Ohm 2.0 earned high scores in adaptability largely because they are the two packs where removing the waist belt and frame for light loads is a simple process.


While stripping the pack down is a great feature for light loads, a pack that allows you to strap bulky but light items to the outside is awesome when you need to carry big loads. Each of these packs has multiple ways to add bulky items like a closed cell foam pad to the outside. And while in general we are not a big fan of lids for ultralight packs, they do create one key advantage…the ability to carry bulky items on top of the main compartment secured under the adjustable lid. The Exos 48 earned a top adaptability score because of its ability to carry heavy loads well with myriad external storage and lashing options. The Hyperlite Mountain Gear Windrider 3400 also earned a top score: its two aluminum frame stays can be removed (though not the waist belt), and the external lash system and very tall roll top provide options for bulky but light gear when a big food resupply occupies the main pack.

The best packs provide the ability to scale up and down in volume or carry big light items easily on the exterior. The incredibly light Arc Blast still maintains the important feature of lash straps for a foam pad.
The best packs provide the ability to scale up and down in volume or carry big light items easily on the exterior. The incredibly light Arc Blast still maintains the important feature of lash straps for a foam pad.

Our adaptability score also considers ease of use with a bear canister. This will be irrelevant to some, but bear canisters are required by regulation on some portions of the PCT and AT. The BearVault BV500 is perhaps the most common bear canister used by weight-conscious hikers in areas where bear-proof food storage is required in the backcountry. We loaded each pack up with a common three-season kit and five days of food in the BV500 to see how well it fits inside and how much room is left over for the rest of your stuff. If you regularly carry a bear canister of this size, only the Windrider 3400 easily accommodates it (this pack earned a "Good" rating) among our pool of competitors. Our three award winners we rated 'Just OK' for use with the BV500; it fits inside, but the smaller diameter of these packs makes packing around it a challenge. See each pack's individual review, where in the Other Versions section we point out their cousins with a bit more capacity.

The very tall top of the Windrider 3400's main pack allows you to scale up and down in pack volume. When you go big  you will want your lightest bulky items up top.
The very tall top of the Windrider 3400's main pack allows you to scale up and down in pack volume. When you go big, you will want your lightest bulky items up top.

Durability


How durable can a sub-two-pound backpack be? The answer is that most are surprisingly quite durable. That said, many of these packs require a little more care and attention than load monsters that weigh five or six lbs and use much heavier fabrics and frames. If you plan to carry more than 30 lbs most of the time, the packs in our backpacking backpack review will serve you better. So how durable SHOULD an ultralight backpack be? As a baseline, to achieve an above average score, we think a pack must last for a least one thru-hike of a trail like the PCT or Appalachian Trail. The best of these packs will see you through many thousands of trail miles!


A number of factors go into our rating for durability, which contributes 10% of the total scores. First and foremost, we consider the types of fabric used for the main body of the pack and the exterior pockets. All of these areas are subject to abrasion, especially the pockets if you tend to stuff a lot into them. There are always trade-offs in design, for example very light main pack fabrics are less durable than robust 200 Denier nylon ripstop fabrics. The Mammut Creon Light 45, a pack designed more for off-trail, alpine scrambling, is made of notably durable fabric.

The main fabric of the ULA Ohm 2.0 is likely the most durable over the long haul, but its carbon frame is a liability for rough handling. Our durability rating also considers frame durability and pocket fabrics.

Additionally, the stretchy exterior pocket fabrics that we love for function tend to be more prone to snagging on tree limbs or abrading on rock in comparison to non-stretchy pockets. Unfortunately, it seems that you can't have it all. We think that a stretchy main exterior pocket with durable side pockets is the best compromise. This is the design choice made by Gossamer Gear for the Editors' Choice winning Gorilla.

And while it is the case that you'll need to treat your pack nicely (it is your home on your back!), we also take into consideration whether sitting on the pack while it is loaded or rough handling in the back of your van or truck could break the frame. To this end, we think that if you are focused on durability or if you are known to be rough on your gear, you should choose a pack with an aluminum frame versus carbon fiber. The rugged aluminum frame is one of the many small factors that lead us to prefer the Gossamer Gear Gorilla over the ULA Ohm 2.0. The Ohm's carbon rod frame is significantly more fragile. Out of our top scorers, the Gorilla and Windrider are the two models we feel comfortable sitting on without worry of breaking something.

The top five scoring packs in our review all packed with the same load: 13 lb base weight and five days of food and fuel. What items you carry  and where  in the external storage is a matter of personal choice. We like to have our rain gear  snacks and water  and often our cookset handy for quick breaks (with coffee!).
The top five scoring packs in our review all packed with the same load: 13 lb base weight and five days of food and fuel. What items you carry, and where, in the external storage is a matter of personal choice. We like to have our rain gear, snacks and water, and often our cookset handy for quick breaks (with coffee!).

Key Accessories


A rain cover for your backpack has long been one of the key accessories to ensure your backpacking kit stays dry through rainstorms. The Osprey UL Raincover is a dependable and widely available choice, as are the covers from Sea to Summit.

The Windrider is one of the only backpacks we tested that is essentially waterproof.
The Windrider is one of the only backpacks we tested that is essentially waterproof.

Waterproof roll top style dry bags or Cuben stuff sacks are an excellent choice for both organization and moisture protection inside your backpack. Sea to Summit's ultralight Sil-Nylon bags are an excellent choice. For those seeking to really shave off the grams, Hyperlite Mountain Gear, ZPacks, and several other ultralight manufacturers produce a large variety of Cuben fiber storage and stuff sacks.

Lining your backpack with a contractor's plastic garbage bag, or better yet a trash compactor bag, has long been a great option to ensure your kit stays dry during long rainy days on the trail. While one of these should last you for a week or more with a little care, you would replace it often while thru-hiking. Cuben fiber pack liners are the state-of-the-art in super light and durable waterproof pack liners. The models available from ZPacks are the best we've seen.

An ultralight backpack is just one of the many products featured in our Dream Backpacking Gear List. Check it out for all of our "dream" backpacking gear and clothing in one spot!

You might also want to check out this video on how to use sleeping pad as a back pad in an ultralight backpack.

Conclusion


We hiked high and low  from the Continental Divide to the Appalachian Trail  to find the best ultralight backpacks! Here  our lead tester  Brandon  celebrates another beautiful day in Rocky Mountain National Park with the Osprey Exos 48  our Best Buy winner.
We hiked high and low, from the Continental Divide to the Appalachian Trail, to find the best ultralight backpacks! Here, our lead tester, Brandon, celebrates another beautiful day in Rocky Mountain National Park with the Osprey Exos 48, our Best Buy winner.

There are a lot of advantages to going ultralight, and we hope these analyses and assessments in this review help you drop weight in your kit without sacrificing features you love. While low weight is key, it's not the only piece of the puzzle. If you need more help in narrowing down your options, be sure to check out our Buying Advice article.

Brandon Lampley
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