Gregory Nano 20 vs Waterfly Travel Elite 2-in-1 Lightweight Backpack 21L
The Gregory Nano 20 is 20L and 0.54kg1.2lb; the Waterfly Travel Elite 2-in-1 Lightweight Backpack 21L is 21L and 0.53kg1.2lb. The Waterfly Travel Elite 2-in-1 Lightweight Backpack 21L is 0.01kg0lb lighter. The Gregory Nano 20 fits the carry-on limit of 35 of 36 major airlines and the Waterfly Travel Elite 2-in-1 Lightweight Backpack 21L fits 32; under the seat, 0 and 0 of 26.
| Spec | Gregory Nano 20 | Waterfly Travel Elite 2-in-1 Lightweight Backpack 21L |
|---|---|---|
| Price | n/a | $22.99 |
| Volume | 20L | 21L |
| Weight | 0.54kg1.2lb | 0.53kg1.2lbBest |
| Carry-on compliance | 97%Best | 89% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 52×28×19cm20.5×11×7.5in | 43.2×26.7×20.3cm17×10.5×8in |
| Laptop | no laptop sleeve | n/a |
| Bottle pockets | 2 | 2 |
| Compression straps | 2 | n/a |
| Opening | large zippered main compartment | Zippered main compartment |
| Warranty | 50 years | 10 years |
| Organizer | Yes | No |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | No |
| Frame sheet | No | No |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Removable | No |
| Sternum strap | Yes | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 210D high density recycled nylon and 450D recycled polyester with PFAS-free C0 DWR, 135D recycled polyester lining | Tear-resistant, water-resistant nylon, polyester lining |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Gregory Nano 20 | Waterfly Travel Elite 2-in-1 Lightweight Backpack 21L |
|---|---|---|---|
| Air Arabia | Carry-on | Fits | Too big |
| Air India | Carry-on | Fits | Too big |
| Qatar Airways | Carry-on | Too big | Fits |
| Ryanair | Carry-on | Fits | Too big |
| Vueling | Carry-on | 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.