Rab Ascendor 45L Mountain Pack vs Tom Bihn Aeronaut 45
The Rab Ascendor 45L Mountain Pack is 45L and 1.31kg2.9lb; the Tom Bihn Aeronaut 45 is 45L and 1.4kg3.1lb. The Rab Ascendor 45L Mountain Pack is 0.09kg0.2lb lighter. The Rab Ascendor 45L Mountain Pack costs $140 less. The Rab Ascendor 45L Mountain Pack fits the carry-on limit of 0 of 36 major airlines and the Tom Bihn Aeronaut 45 fits 14; under the seat, 0 and 0 of 26.
| Spec | Rab Ascendor 45L Mountain Pack | Tom Bihn Aeronaut 45 |
|---|---|---|
| Price | $215Best | $355 |
| Volume | 45L | 45L |
| Weight | 1.31kg2.9lbBest | 1.4kg3.1lb |
| Carry-on compliance | 0% | 39%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 71×35×27cm28×14×10.5in | 36×56×23cm14×22×9in |
| Laptop | n/a | no laptop sleeve |
| Compartments | n/a | 5 |
| Bottle pockets | n/a | 0 |
| Compression straps | n/a | 2 |
| Opening | Top-loading, Detachable lid with drawstring opening, plus side entry | Clamshell, clamshell (U-shape) |
| Warranty | Lifetime | Lifetime |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | No |
| Frame sheet | Removable | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Removable | No |
| Sternum strap | Yes | Yes |
| Load lifters | No | No |
| Shoulder strap | No | Yes |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | 210D Robic Ripstop Nylon with Trishield Dura Coating, 200D polyester / Hydroshield lining | U.S. 1050d high-tenacity ballistic nylon exterior (default Black 1050 Ballistic), 210d Cerylon ripstop interior (bluesign-certified) |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Rab Ascendor 45L Mountain Pack | Tom Bihn Aeronaut 45 |
|---|---|---|---|
| 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 |
| Singapore Airlines | Carry-on | Too big | Fits |
| Southwest 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.