Gossamer Gear Elixir 20 Ultralight Daypack vs Waterfly TransformerX Ultralight Packable Backpack 20L
The Gossamer Gear Elixir 20 Ultralight Daypack is 20L and 0.18kg0.4lb; the Waterfly TransformerX Ultralight Packable Backpack 20L is 20L and 0.29kg0.6lb. The Gossamer Gear Elixir 20 Ultralight Daypack is 0.11kg0.2lb lighter. The Waterfly TransformerX Ultralight Packable Backpack 20L costs $199.01 less. The Gossamer Gear Elixir 20 Ultralight Daypack fits the carry-on limit of 36 of 36 major airlines and the Waterfly TransformerX Ultralight Packable Backpack 20L fits 36; under the seat, 10 and 9 of 26.
| Spec | Gossamer Gear Elixir 20 Ultralight Daypack | Waterfly TransformerX Ultralight Packable Backpack 20L |
|---|---|---|
| Price | $225 | $25.99Best |
| Volume | 20L | 20L |
| Weight | 0.18kg0.4lbBest | 0.29kg0.6lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 38%Best | 35% |
| Dimensions | 42.5×21×15cm16.5×8.5×6in | 42.9×29×14cm17×11.5×5.5in |
| Laptop | no laptop sleeve | n/a |
| Compartments | 1 | n/a |
| Bottle pockets | 2 | 2 |
| Opening | Roll-top, Two-way connect roll top | Zippered main compartment |
| Warranty | 1 year | 10 years |
| Torso length | 41.3cm (16.5in) | n/a |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Insert sold separately | No |
| Sternum strap | No | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | ALUULA Graflyte V52 (100% polyethylene), PFAS free | Tear-resistant, water-resistant nylon, polyester lining |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Gossamer Gear Elixir 20 Ultralight Daypack | Waterfly TransformerX Ultralight Packable Backpack 20L |
|---|---|---|---|
| United Airlines | Personal item | Fits | Too big |
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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.