Bellroy Lite Daypack 20L vs Waterfly TransformerX 3.0 UltraLight Packable Backpack 20L
The Bellroy Lite Daypack 20L is 20L and 0.4kg0.9lb; the Waterfly TransformerX 3.0 UltraLight Packable Backpack 20L is 20L and 0.34kg0.7lb. The Waterfly TransformerX 3.0 UltraLight Packable Backpack 20L is 0.06kg0.1lb lighter. The Waterfly TransformerX 3.0 UltraLight Packable Backpack 20L costs $77.01 less. The Bellroy Lite Daypack 20L fits the carry-on limit of 36 of 36 major airlines and the Waterfly TransformerX 3.0 UltraLight Packable Backpack 20L fits 36; under the seat, 0 and 9 of 26.
| Spec | Bellroy Lite Daypack 20L | Waterfly TransformerX 3.0 UltraLight Packable Backpack 20L |
|---|---|---|
| Price | $99 | $21.99Best |
| Volume | 20L | 20L |
| Weight | 0.4kg0.9lb | 0.34kg0.7lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 35%Best |
| Dimensions | 47×35×14cm18.5×14×5.5in | 41.9×29×15.5cm16.5×11.5×6in |
| Laptop | no laptop sleeve | n/a |
| Bottle pockets | 1 | 2 |
| Compression straps | 0 | n/a |
| Opening | n/a | Zippered main compartment |
| Warranty | 6 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 | Removable | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | Dura Lite recycled nylon ripstop | Abrasion and tear-resistant polyester, polyester lining |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Bellroy Lite Daypack 20L | Waterfly TransformerX 3.0 UltraLight Packable Backpack 20L |
|---|---|---|---|
| Air Canada | Personal item | Too big | Fits |
| 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 |
| JetBlue Airways | 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.