Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L vs Waterfly TransformerX 5.0 UltraLight Packable Backpack 28L
The Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L is 30L and 0.42kg0.9lb; the Waterfly TransformerX 5.0 UltraLight Packable Backpack 28L is 28L and 0.44kg1lb. The Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L is 0.02kg0lb lighter. The Waterfly TransformerX 5.0 UltraLight Packable Backpack 28L costs $1 less. The Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L fits the carry-on limit of 32 of 36 major airlines and the Waterfly TransformerX 5.0 UltraLight Packable Backpack 28L fits 36; under the seat, 0 and 1 of 26.
| Spec | Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L | Waterfly TransformerX 5.0 UltraLight Packable Backpack 28L |
|---|---|---|
| Price | $26.99 | $25.99Best |
| Volume | 30L | 28L |
| Weight | 0.42kg0.9lbBest | 0.44kg1lb |
| Carry-on compliance | 89% | 100%Best |
| Personal-item compliance | 0% | 4%Best |
| Dimensions | 49×31.8×21.8cm19.5×12.5×8.5in | 46×31×20cm18×12×8in |
| Bottle pockets | 2 | 2 |
| Opening | Zippered main compartment | Main compartment pocket |
| Warranty | 10 years | 10 years |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | 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 |
| Bike-ready | No | No |
| Material | Nylon, polyester lining | Nylon, polyester lining |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L | Waterfly TransformerX 5.0 UltraLight Packable Backpack 28L |
|---|---|---|---|
| Air Arabia | Carry-on | Too big | Fits |
| Air India | Carry-on | Too big | Fits |
| Frontier Airlines | Personal item | Too big | Fits |
| Ryanair | Carry-on | Too big | Fits |
| Vueling | 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.