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Gorilla 40 Ultralight Backpack


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Gear Notes

Back to the old style lid with upgraded features like lighter, tougher fabric and a release buckle for your side compression this is the best Gorilla EVER.

Lightweight but surprisingly durable, the Gorilla is suitable for shorter trips or hikers who know how to crush it in the minimalism department.

The Gorilla holds everything you need when you refuse to bring everything. Winner of Outdoor Gear Lab’s Editor’s Choice award for best mid-volume light backpack, its versatility, durability and comfort make it the best weekend companion you’ll ever have. Also works on longer trips and through hikes with itineraries including grocery/laundry opportunities.

* When using this pack without the belt you must remove the internal stay.

Not sure which backpack to choose? Compare our ultralight packs!


  • Belt with added stiffener and stay integration for superior load transfer and comfort
  • New buckles on side compression
  • Unisex ergonomic belt shape
  • The pack comes with a medium belt installed and small and large belts are sold separately to allow customers to choose the size they need
  • Tabs for attaching the fast belt and going frameless
  • Unisex ergonomic harness for both men and women
  • Dual exit hydration tube exit port
  • Internal hydration sleeve and drinking tube keeper loops on both shoulder straps
  • Two side mesh bottle pockets accessible while wearing pack
  • Full side and top compression
  • Air-mesh fabric on shoulder straps and hipbelt for less friction, more cushion and more comfort
  • Rear mesh pocket great for drying gear and other gear storage
  • Trekking pole hardware for storing them outside the pack
  • Made of our custom 70 and 100 denier Robic nylon
  • Lash loop for ice axe
  • Includes a SitLight pad and a removable stay
  • Updated hipbelt with stay coupler
  • Recommended for loads of 30 pounds or less


Backpack Size (Varies greatly depending on body type and how you wear your pack)

Small 17.25” (11.5" - 15.5" torso)
(29 - 39 cm)
Generally fits people 5'6" and under

Medium 20.25” (15.5" - 19.5" torso)
(39 - 50 cm)
Generally fits people 5'5" to 6'0"

Large 23.25” (19.5" - 23.5" torso)
(50 - 60+ cm)
Generally fits people 6'0" and up

Hip Belt Size (Medium belt included and installed)

*Small hip belt (22" - 32" waist)
(56 - 81 cm)

Included Medium hip belt (28" - 45" waist)
(71 - 114 cm)

*Large hip belt (32" - 50" waist)
(81 - 127 cm)

*Sold separately


Average Weight Medium Gorilla

Pack body 18.4 oz / 521 g

Pack frame 3.0 oz / 85 g

Sitlight pad 2.1 oz / 60 g

Total with no belt 20.5 oz / 581 g

Total with small belt 29.8 oz / 844 g

Total with medium belt 30.5 oz / 865 g

Total with large belt 31.2 oz / 884 g

Average Weight Large Gorilla

Pack body 19.0 oz / 538 g

Pack frame 3.5 oz / 99 g

Sitlight pad 2.6 oz / 75 g

Total with no belt 21.6 oz / 612 g

Total with small belt 31.4 oz / 890 g

Total with medium belt 32.1 oz / 910 g

Total with large belt 32.8 oz / 930 g


Total 40 L

in main pack body to extension collar seam 28.8 L

Max Carry Capacity 30 lbs

For Comfort 25 lbs

Dimensions (Medium)

Width 11” / 27.9 cm

Height 22” / 55.9 cm to extension collar seam

Depth 6” / 15.2 cm

Extension collar adds another 11.5” / 29.2 cm of height


Custom 70 denier Robic ripstop nylon

Select use of 100 denier Robic nylon for reinforcement

Air mesh fabric for harness lining

Power mesh fabric pad holder

Custom stretch mesh fabric for big back pocket

Frequently Asked Questions

I see a Medium belt is now included and installed. Where can I find a Small and Large belt?

You can order a different size belt here Hipbelt with Pockets

Customer Reviews

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