Lowe Alpine AirZone Trek 45:55 vs Timbuk2 Impulse Travel Backpack
The Lowe Alpine AirZone Trek 45:55 is 45L and 1.68kg3.7lb; the Timbuk2 Impulse Travel Backpack is 45L and 1.7kg3.7lb. The Lowe Alpine AirZone Trek 45:55 is 0.02kg0lb lighter. The Lowe Alpine AirZone Trek 45:55 fits the carry-on limit of 0 of 36 major airlines and the Timbuk2 Impulse Travel Backpack fits 3; under the seat, 0 and 0 of 26.
| Spec | Lowe Alpine AirZone Trek 45:55 | Timbuk2 Impulse Travel Backpack |
|---|---|---|
| Price | n/a | $249 |
| Volume | 45L | 45L |
| Expands to | 55L | n/a |
| Weight | 1.68kg3.7lbBest | 1.7kg3.7lb |
| Carry-on compliance | 0% | 8%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 70×34×32cm27.5×13.5×12.5in | 57×34×15.7cm22.5×13.5×6in |
| Laptop | n/a | 17" |
| Bottle pockets | 2 | n/a |
| Opening | Top-loading, Lidded top opening plus zipped front entry, with a divider panel | n/a |
| Warranty | n/a | Lifetime |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | No |
| Frame sheet | No | No |
| Water-resistant | No | Yes |
| Rain cover | Yes | No |
| MOLLE | No | No |
| Hip belt | Yes | Hideable |
| Sternum strap | No | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Lowe Alpine AirZone Trek 45:55 | Timbuk2 Impulse Travel Backpack |
|---|---|---|---|
| Frontier Airlines | Carry-on | Too big | Fits |
| Singapore Airlines | Carry-on | Too big | Fits |
| Southwest Airlines | 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.