Waterfly SUMMIT-X UltraLight Packable Backpack 15L vs Waterfly TrailVest UltraLight Packable Backpack 15L
The Waterfly SUMMIT-X UltraLight Packable Backpack 15L is 15L and 0.31kg0.7lb; the Waterfly TrailVest UltraLight Packable Backpack 15L is 15L and 0.27kg0.6lb. The Waterfly TrailVest UltraLight Packable Backpack 15L is 0.04kg0.1lb lighter. The Waterfly TrailVest UltraLight Packable Backpack 15L costs $2 less. The Waterfly SUMMIT-X UltraLight Packable Backpack 15L fits the carry-on limit of 36 of 36 major airlines and the Waterfly TrailVest UltraLight Packable Backpack 15L fits 36; under the seat, 9 and 9 of 26.
| Spec | Waterfly SUMMIT-X UltraLight Packable Backpack 15L | Waterfly TrailVest UltraLight Packable Backpack 15L |
|---|---|---|
| Price | $34.99 | $32.99Best |
| Volume | 15L | 15L |
| Weight | 0.31kg0.7lb | 0.27kg0.6lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 35% | 35% |
| Dimensions | 41.9×27.9×11.9cm16.5×11×4.5in | 41.9×25.9×15cm16.5×10×6in |
| Laptop | n/a | 16.2" |
| Bottle pockets | 2 | 2 |
| Opening | Zippered main compartment | Zippered main compartment |
| Warranty | 10 years | 10 years |
| Organizer | No | No |
| 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 | Yes | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | Tear-resistant, water-repellent nylon, polyester lining | Tear-resistant nylon, polyester lining |
| Last checked | 2026-10 | 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.