ALPAKA Momentum Sling vs Alpha One Niner Axis Sling
The ALPAKA Momentum Sling is 2L and 0.28kg0.6lb; the Alpha One Niner Axis Sling is 1.5L and 0.28kg0.6lb. They weigh the same. The ALPAKA Momentum Sling costs $10 less. The ALPAKA Momentum Sling fits the carry-on limit of 36 of 36 major airlines and the Alpha One Niner Axis Sling fits 36; under the seat, 26 and 25 of 26.
| Spec | ALPAKA Momentum Sling | Alpha One Niner Axis Sling |
|---|---|---|
| Price | $89Best | $99 |
| Volume | 2L | 1.5L |
| Weight | 0.28kg0.6lb | 0.28kg0.6lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 100%Best | 96% |
| Dimensions | 15×30×6cm6×12×2.5in | 15.5×32×6.5cm6×12.5×2.5in |
| Laptop | no laptop sleeve | no laptop sleeve |
| Opening | wide-opening zip main compartment | n/a |
| Warranty | Lifetime | 5 years |
| 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 | No | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | Axodyne weatherproof composite; YKK AquaGuard zippers | Dimension-Polyant X42 with 200D UHMWPE ripstop lining |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | ALPAKA Momentum Sling | Alpha One Niner Axis Sling |
|---|---|---|---|
| Vietjet Air | Personal item | Fits | Too big |
Add more bags to this comparison
Specs come from each brand's own product page. Fit uses listed dimensions in any orientation. How we score carry-on fit.