ALPAKA Flight Sling (2L) vs WaterField Designs Shinjuku Sling
The ALPAKA Flight Sling (2L) is 2L and 0.24kg0.5lb; the WaterField Designs Shinjuku Sling is 1.6L and 0.25kg0.6lb. The ALPAKA Flight Sling (2L) is 0.01kg0lb lighter. The ALPAKA Flight Sling (2L) costs $80 less. The ALPAKA Flight Sling (2L) fits the carry-on limit of 36 of 36 major airlines and the WaterField Designs Shinjuku Sling fits 36; under the seat, 26 and 26 of 26.
| Spec | ALPAKA Flight Sling (2L) | WaterField Designs Shinjuku Sling |
|---|---|---|
| Price | $49Best | $129 |
| Volume | 2L | 1.6L |
| Weight | 0.24kg0.5lbBest | 0.25kg0.6lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 100% | 100% |
| Dimensions | 17×25×5cm6.5×10×2in | 12.7×20.3×6.4cm5×8×2.5in |
| Laptop | no laptop sleeve | no laptop sleeve |
| Opening | zip main compartment | main compartment zip, front zip pocket, back zip pocket |
| Warranty | Lifetime | Lifetime |
| 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 | Removable |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | Axoflux 400D ripstop nylon exterior; Axoflux X-Grid 150D ripstop polyester interior; YKK AquaGuard zippers | 15 oz waxed canvas or 1680D ballistic nylon, full-grain leather accents, YKK waterproof zippers |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
Both bags pass and fail the same airline size limits.
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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.