ALPAKA Momentum Backpack vs Mountainsmith Trippin Pack
The ALPAKA Momentum Backpack is 22L and 0.7kg1.5lb; the Mountainsmith Trippin Pack is 22L and 0.68kg1.5lb. The Mountainsmith Trippin Pack is 0.02kg0lb lighter. The Mountainsmith Trippin Pack costs $99.05 less. The ALPAKA Momentum Backpack fits the carry-on limit of 36 of 36 major airlines and the Mountainsmith Trippin Pack fits 36; under the seat, 0 and 7 of 26.
| Spec | ALPAKA Momentum Backpack | Mountainsmith Trippin Pack |
|---|---|---|
| Price | $159 | $59.95Best |
| Volume | 22L | 22L |
| Weight | 0.7kg1.5lb | 0.68kg1.5lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 27%Best |
| Dimensions | 48×30×17cm19×12×6.5in | 44.5×26×17.8cm17.5×10×7in |
| Laptop | 16" | n/a |
| Bottle pockets | 1 | n/a |
| Opening | wide-opening zip main compartment | Zippered main compartment |
| Warranty | Lifetime | Lifetime |
| Torso length | n/a | 48.3 to 53.3cm (19 to 21in) |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Material | Axodyne weatherproof composite; YKK AquaGuard zippers | 210D Robic Dynajin nylon ripstop UTS, 210D recycled nylon SD Oxford PU, Vislon zippers |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | ALPAKA Momentum Backpack | Mountainsmith Trippin Pack |
|---|---|---|---|
| Allegiant Air | Personal item | Too big | Fits |
| American Airlines | Personal item | Too big | Fits |
| British Airways | Personal item | Too big | Fits |
| easyJet | Personal item | Too big | Fits |
| Frontier Airlines | Personal item | Too big | Fits |
| LATAM Airlines | Personal item | Too big | Fits |
| Volaris | Personal item | 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.