Gossamer Gear Gorilla 50 Ultralight Backpack vs Ortlieb X-Tremer 59L
The Gossamer Gear Gorilla 50 Ultralight Backpack is 50L and 0.91kg2lb; the Ortlieb X-Tremer 59L is 59L and 0.79kg1.7lb. The Ortlieb X-Tremer 59L is 0.12kg0.3lb lighter. The Ortlieb X-Tremer 59L costs $155 less. The Gossamer Gear Gorilla 50 Ultralight Backpack fits the carry-on limit of 3 of 36 major airlines and the Ortlieb X-Tremer 59L fits 0; under the seat, 0 and 0 of 26.
| Spec | Gossamer Gear Gorilla 50 Ultralight Backpack | Ortlieb X-Tremer 59L |
|---|---|---|
| Price | $275 | $120Best |
| Volume | 50L | 59L |
| Weight | 0.91kg2lb | 0.79kg1.7lbBest |
| Carry-on compliance | 8%Best | 0% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 61×28×12cm24×11×4.5in | 70×31×31cm27.5×12×12in |
| Laptop | no laptop sleeve | n/a |
| Compartments | 1 | n/a |
| Opening | Quick-access fold-over lid | Roll-top, roll closure |
| Warranty | 1 year | 5 years |
| Torso length | 40.6 to 55.9cm (16 to 22in) | n/a |
| Sizes | Small, Medium, Large | n/a |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | No |
| Frame sheet | Removable | No |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Removable | No |
| Sternum strap | Yes | Yes |
| Load lifters | Yes | No |
| 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 | PVC-coated polyester (pd620), PVC-coated Cordura (ps620c) |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Gossamer Gear Gorilla 50 Ultralight Backpack | Ortlieb X-Tremer 59L |
|---|---|---|---|
| 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.