Gregory Retna 20 vs Topo Designs Classic Teardrop Backpack
The Gregory Retna 20 is 20L and 0.54kg1.2lb; the Topo Designs Classic Teardrop Backpack is 20L and 0.54kg1.2lb. They weigh the same. The Gregory Retna 20 fits the carry-on limit of 32 of 36 major airlines and the Topo Designs Classic Teardrop Backpack fits 36; under the seat, 0 and 0 of 26.
| Spec | Gregory Retna 20 | Topo Designs Classic Teardrop Backpack |
|---|---|---|
| Price | n/a | $99 |
| Volume | 20L | 20L |
| Weight | 0.54kg1.2lb | 0.54kg1.2lb |
| Carry-on compliance | 89% | 100%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 50×29×21cm19.5×11.5×8.5in | 47×30.5×15.2cm18.5×12×6in |
| Laptop | 15"Best | 14" |
| Bottle pockets | 1 | 1 |
| Opening | n/a | Main compartment top and side-entry zippers |
| Warranty | 50 years | Lifetime |
| Organizer | Yes | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | Removable | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 100% recycled 300D polyester ripstop with PFAS-free C0 DWR, 135D recycled polyester lining | 400D recycled nylon, 1000D recycled nylon, 210D recycled nylon liner, full grain leather lash tabs |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Gregory Retna 20 | Topo Designs Classic Teardrop Backpack |
|---|---|---|---|
| Air Arabia | Carry-on | Too big | Fits |
| Air India | Carry-on | 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.