Tortuga Packable Backpack vs Waterfly TransformerX Ultralight Packable Backpack 20L
The Tortuga Packable Backpack is 19L and 0.3kg0.7lb; the Waterfly TransformerX Ultralight Packable Backpack 20L is 20L and 0.29kg0.6lb. The Waterfly TransformerX Ultralight Packable Backpack 20L is 0.01kg0lb lighter. The Waterfly TransformerX Ultralight Packable Backpack 20L costs $54.010000000000005 less. The Tortuga Packable Backpack fits the carry-on limit of 36 of 36 major airlines and the Waterfly TransformerX Ultralight Packable Backpack 20L fits 36; under the seat, 1 and 9 of 26.
| Spec | Tortuga Packable Backpack | Waterfly TransformerX Ultralight Packable Backpack 20L |
|---|---|---|
| Price | $80 | $25.99Best |
| Volume | 19L | 20L |
| Weight | 0.3kg0.7lb | 0.29kg0.6lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 4% | 35%Best |
| Dimensions | 46×26×16cm18×10×6.5in | 42.9×29×14cm17×11.5×5.5in |
| Laptop | no laptop sleeve | n/a |
| Bottle pockets | 2 | 2 |
| Compression straps | 0 | n/a |
| Opening | n/a | Zippered main compartment |
| Warranty | Lifetime | 10 years |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | Removable | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 70D ripstop nylon with Extreema-reinforced bottom | Tear-resistant, water-resistant nylon, polyester lining |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Tortuga Packable Backpack | Waterfly TransformerX 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 |
| 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.