Gossamer Gear Gorilla 50 Ultralight Backpack vs Zpacks Arc Haul Ultra 50L
The Gossamer Gear Gorilla 50 Ultralight Backpack is 50L and 0.91kg2lb; the Zpacks Arc Haul Ultra 50L is 50L and 0.63kg1.4lb. The Zpacks Arc Haul Ultra 50L is 0.28kg0.6lb lighter. The Gossamer Gear Gorilla 50 Ultralight Backpack costs $124 less. The Gossamer Gear Gorilla 50 Ultralight Backpack fits the carry-on limit of 3 of 36 major airlines and the Zpacks Arc Haul Ultra 50L fits 0; under the seat, 0 and 0 of 26.
| Spec | Gossamer Gear Gorilla 50 Ultralight Backpack | Zpacks Arc Haul Ultra 50L |
|---|---|---|
| Price | $275Best | $399 |
| Volume | 50L | 50L |
| Weight | 0.91kg2lb | 0.63kg1.4lbBest |
| Carry-on compliance | 8%Best | 0% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 61×28×12cm24×11×4.5in | 74×31.8×16.5cm29×12.5×6.5in |
| Laptop | no laptop sleeve | no laptop sleeve |
| Compartments | 1 | 1 |
| Bottle pockets | n/a | 2 |
| Opening | Quick-access fold-over lid | Roll-top, Roll top closure |
| Warranty | 1 year | 2 years |
| Torso length | 40.6 to 55.9cm (16 to 22in) | 40.6 to 66cm (16 to 26in) |
| Sizes | Small, Medium, Large | Short, Medium, Tall |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | Yes |
| Frame sheet | Removable | Yes |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Removable | Yes |
| Sternum strap | Yes | Yes |
| Load lifters | Yes | Yes |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | 70D and 100D recycled Robic nylon, PFAS free | Ultra 100X (3.3 oz/sqyd) with waterproof backing, stretch mesh pockets, taped seams, PFAS free |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Gossamer Gear Gorilla 50 Ultralight Backpack | Zpacks Arc Haul Ultra 50L |
|---|---|---|---|
| Frontier Airlines | Carry-on | Fits | Too big |
| Singapore Airlines | Carry-on | Fits | Too big |
| Southwest Airlines | Carry-on | Fits | Too big |
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Specs come from each brand's own product page. Fit uses listed dimensions in any orientation. How we score carry-on fit.