Cabin Zero Military Backpack 44L vs Tom Bihn Techonaut 45
The Cabin Zero Military Backpack 44L is 44L and 1.1kg2.4lb; the Tom Bihn Techonaut 45 is 45L and 1.1kg2.4lb. They weigh the same. The Cabin Zero Military Backpack 44L costs $267 less. The Cabin Zero Military Backpack 44L fits the carry-on limit of 28 of 36 major airlines and the Tom Bihn Techonaut 45 fits 14; under the seat, 0 and 0 of 26.
| Spec | Cabin Zero Military Backpack 44L | Tom Bihn Techonaut 45 |
|---|---|---|
| Price | $158Best | $425 |
| Volume | 44L | 45L |
| Weight | 1.1kg2.4lb | 1.1kg2.4lb |
| Carry-on compliance | 78%Best | 39% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 51×36×18cm20×14×7in | 36×56×23cm14×22×9in |
| Laptop | 18"Best | 17" |
| Bottle pockets | 1 | 0 |
| Compression straps | n/a | 0 |
| Opening | Clamshell, Clamshell opening | Clamshell, U-shaped |
| Warranty | Lifetime | Lifetime |
| Organizer | Yes | Yes |
| Shoe compartment | No | Yes |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | No |
| MOLLE | Yes | No |
| Hip belt | Yes | Removable |
| Sternum strap | Removable | Removable |
| Load lifters | Yes | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | 1000 denier nylon body, 200 denier polyester lining, water-resistant coating | 420D Spectron UHMWPE/nylon ripstop (also 630D or 1050D ballistic nylon) |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Cabin Zero Military Backpack 44L | Tom Bihn Techonaut 45 |
|---|---|---|---|
| Air Arabia | Carry-on | Fits | Too big |
| Air Canada | Carry-on | Fits | Too big |
| Air India | Carry-on | Fits | Too big |
| Allegiant Air | Carry-on | Fits | Too big |
| ANA (All Nippon Airways) | Carry-on | Fits | Too big |
| Emirates | Carry-on | Fits | Too big |
| Lufthansa | Carry-on | Fits | Too big |
| Norwegian Air Shuttle | Carry-on | Fits | Too big |
| Ryanair | Carry-on | Fits | Too big |
| SAS | Carry-on | Fits | Too big |
| Turkish Airlines | Carry-on | Fits | Too big |
| Volaris | Carry-on | Fits | Too big |
| Vueling | Carry-on | Fits | Too big |
| Wizz Air | 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.