Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L vs Zpacks Nero Classic 30L
The Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L is 30L and 0.42kg0.9lb; the Zpacks Nero Classic 30L is 30L and 0.28kg0.6lb. The Zpacks Nero Classic 30L is 0.14kg0.3lb lighter. The Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L costs $212.01 less. The Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L fits the carry-on limit of 32 of 36 major airlines and the Zpacks Nero Classic 30L fits 36; under the seat, 0 and 1 of 26.
| Spec | Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L | Zpacks Nero Classic 30L |
|---|---|---|
| Price | $26.99Best | $239 |
| Volume | 30L | 30L |
| Weight | 0.42kg0.9lb | 0.28kg0.6lbBest |
| Carry-on compliance | 89% | 100%Best |
| Personal-item compliance | 0% | 4%Best |
| Dimensions | 49×31.8×21.8cm19.5×12.5×8.5in | 46×29×14cm18×11.5×5.5in |
| Laptop | n/a | no laptop sleeve |
| Compartments | n/a | 1 |
| Bottle pockets | 2 | 2 |
| Opening | Zippered main compartment | Roll-top, Roll top closure |
| Warranty | 10 years | 2 years |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | No |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | Insert sold separately |
| Sternum strap | Yes | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | Nylon, polyester lining | Ultra 100X (3.3 oz/sqyd) base and back, optional Ultra TenX (2.9 oz/sqyd) front, stretch mesh pockets, taped seams, PFAS free |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Waterfly TransformerX 2.0 UltraLight Packable Backpack 30L | Zpacks Nero Classic 30L |
|---|---|---|---|
| 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.