Gossamer Gear Gorilla 50
Ultralight Pack
~$275

Gossamer Gear

Gossamer Gear Gorilla 50

The Gorilla 50 is the Mariposa's smaller, symmetric sibling — 50 liters, under 2 lbs, and the classic 'second pack' people buy once their kit shrinks. It keeps the sit-pad back panel and Robic durability in a cleaner silhouette.

Approx. price
~$275
Capacity
50 L
Weight
1.99 lbs
Best For
Dialed three-season kits that no longer need 60 liters
Buy from Gossamer Gear →

Price and availability on Gossamer Gear’s site may differ.

Type
Ultralight Pack
Frame Type
Internal Frame
Capacity
50 L
Weight
1.99 lbs
Max Recommended Load
30 lbs
Torso Fit
Sized S-L: S 16-18 in, M 18-20 in, L 20-22 in
Material
70D and 100D recycled Robic nylon
Back Panel
Removable SitLight foam pad with aluminium stay
Warranty
Gossamer Gear one-year warranty against manufacturing defects
Raincover Included
No
Fits BV500 Bear Canister
Yes

Features

Hipbelt PocketsHydration SleeveFits Bear Canister

Pros

  • ✓The archetypal 'graduation pack' — the usual ultralight path is buying a Mariposa, shrinking your kit, then buying a Gorilla.
  • ✓Under 2 lbs with a real stay and hipbelt, it carries 30 lbs honestly — better than frameless rivals at similar weight.
  • ✓Symmetric pockets fix the Mariposa's polarizing layout while keeping generous capacity.
  • ✓The removable sit-pad back panel remains one of the smartest dual-use designs in UL.
  • ✓Robic fabric durability matches its big sibling's strong track record.
  • ✓Mixed torso/hipbelt sizing gives semi-custom fit off the shelf.
  • ✓A BV450 fits cleanly; careful packers manage a BV500 vertically.
  • ✓Gossamer Gear's service reputation applies here too.

Cons

  • ✗50 liters is tight for bear-canister trips or 5+ day food carries — buyers routinely wish for 5 more liters.
  • ✗Same sweaty foam back as the Mariposa.
  • ✗The 30 lb ceiling is real; water-heavy desert carries overload it.
  • ✗Fixed sizes, online-only fitting.
  • ✗Mesh pockets remain the wear point in brush.
  • ✗The hipbelt is minimal and divides opinion at the top of the load range.
  • ✗No lid, no organization beyond the pocket array.
  • ✗Price sits close enough to the Circuit that many first-time buyers default to ULA's bigger volume instead.

Common Questions

Gossamer Gear Mariposa 60
~$315
Ultralight Pack

The Mariposa 60 is Gossamer Gear's signature pack, famous for its asymmetric pocket layout — one giant over-the-shoulder pocket that holds a tent, plus six more — and a removable back pad that doubles as a camp sit pad. It's the organized person's ultralight.

60 L7 Pockets2.14 lbs

Weight

2.14 lbs

Capacity

60 L

Frame

Internal Frame

Best for: Hikers who want everything reachable without opening the main bag
Gossamer Gear Skala 38
~$225
Ultralight Pack

Frameless and roll-top, the Skala 38 dates from March 2025: 38 L (30 L main) and 20.4 oz complete, made up of a 14.5 oz body, a 3.6 oz Fastbelt and a 2.3 oz pad. It is rated to 25 lb.

38 L1.3 lbsRoll-top

Weight

1.3 lbs

Capacity

38 L

Frame

Frameless

Best for: Thru-hikers who like a roll-top and want to shed belt and pad on easy days
Gossamer Gear G4-20 42
~$205
Ultralight Pack

Gossamer Gear's frameless classic is the G4-20: 42 L (30 L main), 24.8 oz in Medium, $205. A removable sit pad gives the back its structure, and the fixed hipbelt has pockets.

42 L1.6 lbs$205

Weight

1.6 lbs

Capacity

42 L

Frame

Frameless

Best for: Budget-minded ultralight hikers who want a frameless pack with real torso sizing
Gossamer Gear Murmur 36
~$350
Ultralight Pack

At 7.9 oz, or 10.7 oz with the included torso pad, the ALUULA Murmur 36 is one of the lightest 36 L packs made. It is frameless, rated to 20 lb, with a removable FastBelt.

36 L0.5 lbsALUULA Graflyte

Weight

0.5 lbs

Capacity

36 L

Frame

Frameless

Best for: Experienced hikers with sub-10 lb base weights
Gossamer Gear Fast Kumo 36
~$190
Ultralight Pack

A vest-style harness and a detachable Fastbelt carrying zip stretch-mesh pockets turn the 36 L Kumo into the Fast Kumo, a fastpacking take on the pack. It weighs 20.7 oz (S/M) or 21.5 oz (M/L) and costs $190.

36 L1.3 lbsVest harness

Weight

1.3 lbs

Capacity

36 L

Frame

Frameless

Best for: Fastpackers and runners covering big days with overnight gear
Gossamer Gear Kumo 36
~$180
Ultralight Pack

The Kumo is Gossamer Gear's frameless 36 L, using the removable SitLight pad as both back structure and camp seat. At $180 it is one of the best-value frameless packs available.

36 L1.25 lbs70D and 100D recycled Robic nylon

Weight

1.25 lbs

Capacity

36 L

Frame

Frameless

Best for: Low-base-weight hikers and overnighters wanting a cheap frameless pack