Gorilla 40 Ultralight Backpack

The Gorilla is the go-to pack for the lightweight weekend warrior. Its versatility, comfort, and fit will keep you reaching for it on your next adventure.

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Description The Gorilla 40 liter is a versatile mid-size pack with 4 built in pockets, side compression webbing, and a rugged exterior. Whether your weekend plans include a trek in dense forests or a ramble on high alpine ridges, the Gorilla Ultralight Backpack has the options you need, without weighing you down.

  • Recommended for loads of 30 pounds or less

  • Made of our custom 100 and 200 denier Robic nylon

  • It comes with a SitLight™ pad, removable stay, one meter of cord, and 2 cord locks. The belt is sold separately to allow customers to choose the size they need

  • Two side mesh bottle pockets accessible without taking off pack

  • Air-mesh fabric on shoulder straps and hipbelt for less friction, more cushion and more comfort

  • OTT™ (Over-the-Top) closure system provides an easy secure closure

  • Rear mesh pocket great for drying gear and other gear storage

  • New trekking pole hardware for storing them outside the pack

  • Hipbelt system includes built-in pockets (none on X-Small)

  • Internal hydration sleeve and drinking tube keeper loops on both shoulder straps

  • New unisex Ergonomic harness for both men and women

  • Side lash loop for ice axe

  • Includes new updated removable internal stay system

Frequently Asked Questions

Does a Bear Canister fit inside the Gorilla? Yes it will! All sizes of bear protection will fit vertically in this backpack. Smaller models like the Bare Boxer and the Bear Vault 450 will fit horizontally inside.

Can I use my hydration bladder with a Gorilla? Yes you can! This pack has an internal hydration sleeve and the hose can be stored on either should straps. We suggest using the Inline Hose Adaptor for your convenience.

Unsure? Browse which pack features are right for you!

Additional Info

Additional Info


Need help with the sizing? Find out how to properly fit a backpack!


  • Small : 24.7 oz ( 701 g ) Average Total for all items included

  • Medium : 26 oz ( 737g ) Average Total for all items included

  • Large: 28 oz   ( 793 g. )  Average Total for all items included

This includes

  • Pack Body = 

    14.10 oz ( 400 g ) (Average for Small size)

    14.95 oz ( 424 g ) (Average for Medium size)

    16.25 oz ( 460 g ) (Average for Large size)

  • Removable hip belt = 5.2 oz. (148 g.)

  • Aluminum curved stay = 3.4 oz. each (96 g.) (Average)

  • Sitlight Pad  = 2.0 oz  ( 51 g. ) (Average)

Capacity (Size Medium)

  • 2,354 c.i. (40 l.) total

  • 1,760 c.i. (28.84 l.) in main pack body to extension collar seam

  • 30 lb maximum carry capacity


  • Small (13" - 16" torso) (33 - 41 cm.) Generally fits people 4' 11" to 5' 4"

  • Medium (16" - 19" torso) (41 - 48 cm.) Generally fits people 5'4" to 5'9"

  • Large (19" - 22" torso) (48 - 56 cm.) Generally fits people 5'9" to 6'2"

Dimensions (Size Medium)

  • Height 23” to the extension collar only

  • Width 11”

  • Depth 6”

  • Extension collar adds another 9” of height


  • Custom 100 denier Robic ripstop nylon

  • Select use of 200 denier Robic nylon for reinforcement.

  • Select use of 70 denier silicone coated ripstop (silnylon)

  • Air mesh fabric for harness lining

  • Power mesh fabric pad holder

  • Custom stretch mesh fabric for big back pocket


  • Grey, Black and Gold

Hip Belt Size (Sold Separately)

  • X-Small hip belt (22" - 28" waist (55.88 - 71.12 cm.) (No pockets)

  • Small hip belt (25" - 32" waist) (64 - 81 cm.)

  • Medium hip belt (32" - 38" waist) (76 - 96.5 cm.)

  • Large hip belt (38" - 44" waist) (91.4 - 112 cm.)

  • X-Large hip belt  (44"-60") (107 - 152 cm.)


LOVE IT!!Review by jonfouquier
Absolutely perfect! it truly forces you to go ultralight. It has honestly changed the game for me! took it on many trips this past summer and i can't wait for more. went on a trip to the enchantments in Washington State with it and it was perfect for the occasion. (Posted on 1/6/16)
Fiancée ApprovedReview by Jonathan
This pack has so far exceeded my expectations. I am 5'7", 145lbs, and went with the medium pack + small hip belt. With some minor adjustments, it fits a treat. I ordered the torso length Nighlight Sleeping Pad to use instead of the SitLight pad and it fits very nicely. I was a bit worried that it would push the load a bit further off my back, causing more strain, but if you're using the pack for what it's rated (30lbs or less), than you shouldn't feel any difference. Plus, this hip belt works. A few of my past packs were ill-fitted to me, and all of the weight ended up on my shoulders and back. With the GG Gorilla, I can shrug my shoulders and not feel like I'm at the gym.

Because of my work schedule changing, I will have off Friday-Sunday and will have to be back to work Monday at 1pm. This pack is perfect for those 3-night trips that I will be seeing more of, though it could definitely accommodate food and fuel for double that.

My one complaint, which is easily fixed by simple modifications, is that the pack adjustment fabrics are way longer than necessary. But, if this is my biggest issue with the pack, I am not worried in the least. Most importantly, the fiancée, who works in design, approves because it coordinates with our Tarptent Double Rainbow. (Posted on 12/24/15)
Gorilla 40 Ultralight BackpackReview by stkeys
I have used this pack twice now including my recent hike on the Old Loggers Path in PA. What can I say that has not already been said about this backpack. It's light, comfortable, durable, plenty of room, and well thought out design. I love it but, yes I have just one complaint. It's to strappy... compression straps should be shorter. Not a big deal it just bugs me. (Posted on 11/6/15)
Super light and streamlinedReview by Kimberly
When I first got into backpacking I didn't know how important it was to have a lightweight backpack. I just went for a pack large and comfortable enough. Now that I've transitioned to ultralight it isn't important that I have a huge, bulky, built up comfy belt.
Now that I have the Gorilla I see how unnecessary all of that bulk is and actually how much of a hindrance it is! My pack is so much lighter now! I am not a large person so I really notice every pound on my pack. Before I loved backpacking and camping out at the destination-- just hated all the work and carrying the heavy weight to get there. Now that my pack is lightweight I can enjoy my whole trip and feel free tromping through the woods. (Posted on 11/6/15)
FantatsicReview by Heliotrope
Recently purchased a Gorilla to fit the bill of an ultralight pack that can handle heavier loads such as desert water carrys and week long food carrys. I just finished a trip where I loaded the pack with 16+ lbs of food (for 8 days) plus 20 deg down quilt, 2 person tarp, inflatable pad, canister stove, wool shirt, fleece pullover, rain jacket, wind shirt, gloves, fleece hat, sawyer squeeze, umbrella, headlamp, etc. About 9.5 lbs of gear including the pack. I am pleased that everything fit in the gorilla. I could have squeezed in another insulation layer and another day of food no problem. I think the pack is poorly marketed for weekend warriors. It is clearly capable of handling the long haul comfortably. I love that it's' components ( hip belt, sit pad and frame) can be stripped down for a lighter pack for shorter trips. Totally outstanding backpack! I hope Gossamer Gear recognizes that it has achieved a perfect design and does not ruin it with improvements. (Posted on 10/1/15)
Simple, easy, perfect. Review by Liz Song
I normally use a 52L pack with more bells & whistles, so I was fairly hesitant that the Gorilla would be 1) too small and 2) not the best fit for my frame. Could an ultralight pack really be comfortable and effective? *drumroll*


I took it out for a test hike before taking it on a backpacking trip and instantly experienced the comfort. And, it still felt comfortable throughout my entire 3-day trip. I didn't use the foam back, simply because I'm a heavy back sweater, and the foam made it so I would sweat more profusely than I already do (didn't know that was possible). The side pockets are PERFECT for two lean 1L water bottles. It's easy to grab them and put them back while hiking. The front mesh pocket was excellent for all that extra stuff that you need fast access to.

The other feature I can go on-and-on about are the side pockets on the hipbelt. They're large and can fit more than one might think. It's perfect for cameras/iphone, snacks, sunblock, chapstick, hand sanitizer, etc. It's the best one I've experienced so far on a pack.

I HIGHLY recommend this pack to anyone who's looking for an ultralight pack that doesn't compromise comfort.

PS. I'm 5'3", somewhat petite in frame, and my total pack weight is usually ~22-25 pounds. (Posted on 9/15/15)
My new favorite packReview by E.S.
I use my Gorilla for winter day hikes and non-winter backpacking trips in the Adirondack Mountains of Upstate New York, and most of my time is spent off-trail. Despite hauling this pack up fifty trailless peaks, it has barely a scratch. The Gorilla is ideal for one-week backpacking trips and hefty day hikes year-round. Great stuff. (Posted on 7/24/15)
Perfect For Trekking In NepalReview by Heather
I used the Gorilla for trekking on the Manaslu Circuit in Nepal in October 2014. It worked perfect! I chose not to use a porter so I carried all of my gear for tea house trekking, which was not a lot. The pack carried everything well, around 25lbs plus water and snacks.

(Posted on 4/12/15)
First steps toward ULReview by Jordan
This backpack is a great first step in weight reduction for aspiring minimalist hikers. It will hold all of your hiking gear as well as a few extra doodads that you haven't decided to leave at home yet.

I was worried about sacrificing comfort when searching for a pack that would lower base weight. The lower weight of the pack and my decision to forgo some gear in order to reduce weight made comfort a non-issue.

I put my gear to the test on a regular basis and took this pack on a month of hiking and motorcycling around Wyoming and Montana. It did well ask things considered, but after one season there is some noticeable cosmetic wear. Given my experience with the Gorilla, I plan to purchase my next pack from Gossamer Gear. (Posted on 2/25/15)
LOVE LOVE LOVEReview by Heather
I love this pack. It is light, comfortable, holds everything I need it to and compresses down when I'm headed into town. I've loaded it with climbing gear for an overnight mountaineering trip as well as a 4 day trek on the PCT. I've also used it as a day pack when I needed bulkier layers. The accessible hipbelt and side pockets make my "snackpacking" strategy possible (I eat while walking). The removable frame is also nice for when I am carrying varying loads. The most versatile pack I own. (Posted on 2/20/15)
Great for my bulkier cold-weather gearReview by Dan Bortz
The new Gorilla is a very nice upgrade on an already fine pack. I used the Dyneema model in winter to carry my bulkier cold-weather gear, and the new Robic Nylon model will play the same role in my arsenal. I carried the pack for the first time on a 3-night trip on the Loyalsock Trail in PA.

The new Robic Nylon material (which I've experienced previously with the Type 2 Utility Pack) is really tough. I tend to be really tough on packs, but my Gorilla still looks brand new. The fabric is also fairly water resistant, allowing only minimal water penetration after hiking in rain, sleet, and snow. Did I mention that this stuff looks really slick, too?

The new compression straps and lid straps are all an improvement over the old system of cords and cord locks. I'm guessing this system comes with a minor weight penalty, but the improved functionality is well worth it. The trekking pole holders are also a nice touch. As someone who goes for long periods of time without using his poles, it's nice to have a convenient way to secure them to my pack.

Once I installed the aluminum stay correctly (after an uncomfortable, obscenity-laden 22-mile day), the new Gorilla was super comfortable. To be 100% fair, the backwards stay was completely my own fault. When installed properly, it contoured my back nicely and did a fine job of transferring the pack's weight down to my hips. The new shoulder harness (softer, more breathable padding and a more ergonomic shape) and hip belt are both better than their predecessors and work together to create a very comfortable carry. The addition of a "rib strap" was a nice touch to the harness, as I like using it on my QuikSak, Type 2, and Minimalist, but there wasn't enough slack in the shoulder harness for me to make use of it on the Gorilla. I have very broad shoulders and chest, so I believe the problem lies more with my body shape than with the pack (most backpacking gear tends to fit me strangely).

There are several external pockets (laid out similarly to the previous Gorilla). The mesh used for the back pocket seems durable, and is a nice upgrade over the previously used material. I found it easy to get my water bottles in and out of the bottle pockets while hiking (a HUGE deal to me). The hip belt pockets fit my Otterbox-encased iPhone 5S snugly, but they may be a bit too small for the iPhone 6 or many of the larger Android phones. The other hip belt pocket was perfect for maps and a few snacks. The lid pocket is perfect for a few quick-access items, like my Sawyer Mini filter and my headlamp.

The new Gorilla is both aesthetically and functionally better than its predecessor and is well worth the upgrade. (Posted on 11/27/14)
Ideal 3 season multi day pack.Review by Martin Rye
Gossamer Gear sent me the new 2014 Gorilla pack to review and compare against past versions of the Gorilla which I have owned and used.

With its Dialled-in fit, and varied sizes I had no trouble matching the long size with a medium hipbelt to my 6’2″ frame.

The new shoulder straps are part of the new unisex harness and are by far the best shoulder straps of any version of the Gorilla packs I have used. The shoulder straps are down from 4in wide to 2.5; but thicker and more rounded and more comfortable. Ergonomic designed. I found the comfort notable and improved in use.

Shoulder straps are often overlooked in backpack construction design. It is essential shoulder straps are comfy and aid in effective load transfer and comfort, and the new Gorillas shoulder straps are very comfortable. Now unisex in design the Gorilla is open to so many more people to try and use.

The U frame internal stays supports the loads. While out testing the pack I carried extra kit than I would normally take to see how it coped, and never had any issues carrying the load and was able to hike over very rocky mountain terrain with ease and the stability as the Gorilla was tight to my back with a good centre of gravity from its small compact size.

The the 3rd generation pack has the new Robic material for its construction. It’s a nylon material with a high tensile strength. It’s supposed to be more puncture and abrasion resistant. As it’s 100% nylon and not a mix, this material is claimed to be superior and longer lasting. I so far i'm impressed how this material has not suffered any abrasion - nor shows any signs of damage.

With side compression straps as standard you can tension the pack and reduce volume for a tight, stable carry.

As with past versions of the Gorilla the lid has a pocket and rolls over to close. The closure is improved and you can over-extend the lid. The new side-mounted straps make the lid way better and there are other improved features, like the trekking pole D rings to help stow your poles easier.

But the big points are that integration of the hip-belt, and the vastly improved shoulder straps. The Gorilla uses a Thinlight sit pad that is removable. This sits over the hip-belt which is now thicker and wider, locking it in, which improves lumbar comfort, and the pad is held in place by Power Mesh, which aids in wicking and comfort.

On a recent 3-day hike in the English Lake District I used this pack over some hard mountain terrain, I was impressed with the comfort and stability. What you need from a pack. The big rear pocket again has been improved and there are, if needed, lots of attachment points. Built in hipbelt pockets, big, easy to access on the move side pockets all make for a ideal backpacker’s designed pack.

Comparing the Gorilla to other UL packs it is a fantastic light, and robust pack. Its low weight and ability to carry kit with so much comfort and stability make it a stand out from the crowd pack in the Ultralight market. (Posted on 9/22/14)

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