Ortlieb Atrack 35L vs Vertx Siege 35L
The Ortlieb Atrack 35L is 35L and 1.5kg3.3lb; the Vertx Siege 35L is 35L and 1.45kg3.2lb. The Vertx Siege 35L is 0.05kg0.1lb lighter. The Vertx Siege 35L costs $100.00999999999999 less. The Ortlieb Atrack 35L fits the carry-on limit of 1 of 36 major airlines and the Vertx Siege 35L fits 15; under the seat, 0 and 0 of 26.
| Spec | Ortlieb Atrack 35L | Vertx Siege 35L |
|---|---|---|
| Price | $340 | $239.99Best |
| Volume | 35L | 35L |
| Weight | 1.5kg3.3lb | 1.45kg3.2lbBest |
| Carry-on compliance | 3% | 42%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 59×28×27cm23×11×10.5in | 55.9×27.9×22.9cm22×11×9in |
| Laptop | n/a | 16" |
| Bottle pockets | 2 | 2 |
| Compression straps | 4 | n/a |
| Opening | Panel access, back panel full zip | Zippered main compartment |
| Warranty | 5 years | 2 years |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | No |
| Frame sheet | No | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | No | Yes |
| Hip belt | Yes | Removable |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | PU-coated nylon (PS33) | 330D nylon exterior, 500D laser-cut MOLLE |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Ortlieb Atrack 35L | Vertx Siege 35L |
|---|---|---|---|
| AirAsia | Carry-on | Too big | Fits |
| Alaska Airlines | Carry-on | Too big | Fits |
| American Airlines | Carry-on | Too big | Fits |
| British Airways | Carry-on | Too big | Fits |
| Cebu Pacific | Carry-on | Too big | Fits |
| Delta Air Lines | Carry-on | Too big | Fits |
| easyJet | Carry-on | Too big | Fits |
| Frontier Airlines | Carry-on | Too big | Fits |
| JetBlue Airways | Carry-on | Too big | Fits |
| Qantas | Carry-on | Too big | Fits |
| Southwest Airlines | Carry-on | Too big | Fits |
| United Airlines | Carry-on | Too big | Fits |
| Vietjet Air | Carry-on | Too big | Fits |
| WestJet | Carry-on | Too big | Fits |
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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.