Arc'teryx Heliad 15 Backpack vs Waterfly TransformerX 4.0 UltraLight Packable Backpack 15L
The Arc'teryx Heliad 15 Backpack is 15L and 0.2kg0.4lb; the Waterfly TransformerX 4.0 UltraLight Packable Backpack 15L is 15L and 0.19kg0.4lb. The Waterfly TransformerX 4.0 UltraLight Packable Backpack 15L is 0.01kg0lb lighter. The Waterfly TransformerX 4.0 UltraLight Packable Backpack 15L costs $60.010000000000005 less. The Arc'teryx Heliad 15 Backpack fits the carry-on limit of 36 of 36 major airlines and the Waterfly TransformerX 4.0 UltraLight Packable Backpack 15L fits 36; under the seat, 7 and 10 of 26.
| Spec | Arc'teryx Heliad 15 Backpack | Waterfly TransformerX 4.0 UltraLight Packable Backpack 15L |
|---|---|---|
| Price | $80 | $19.99Best |
| Volume | 15L | 15L |
| Weight | 0.2kg0.4lb | 0.19kg0.4lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27% | 38%Best |
| Dimensions | 44×27×20cm17.5×10.5×8in | 40.6×24.1×15.2cm16×9.5×6in |
| Laptop | no laptop sleeve | n/a |
| Bottle pockets | 0 | 2 |
| Compression straps | 0 | n/a |
| Opening | n/a | Zippered main compartment |
| Warranty | No fixed term | 10 years |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 100D SD Cordura nylon 6,6 dobby face, recycled polyester lining | Tear-resistant, wear-resistant nylon |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Arc'teryx Heliad 15 Backpack | Waterfly TransformerX 4.0 UltraLight Packable Backpack 15L |
|---|---|---|---|
| Air Canada | Personal item | Too big | Fits |
| JetBlue Airways | Personal item | Too big | Fits |
| United Airlines | 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.