ATD Supply ATD2 vs DEFY Menace Backpack 2.0
The ATD Supply ATD2 is 18L and 1.3kg2.9lb; the DEFY Menace Backpack 2.0 is 18L and 1.36kg3lb. The ATD Supply ATD2 is 0.06kg0.1lb lighter. The DEFY Menace Backpack 2.0 costs $157 less. The ATD Supply ATD2 fits the carry-on limit of 36 of 36 major airlines and the DEFY Menace Backpack 2.0 fits 36; under the seat, 7 and 7 of 26.
| Spec | ATD Supply ATD2 | DEFY Menace Backpack 2.0 |
|---|---|---|
| Price | $456 | $299Best |
| Volume | 18L | 18L |
| Expands to | 31L | n/a |
| Weight | 1.3kg2.9lbBest | 1.36kg3lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27% | 27% |
| Dimensions | 45×25×19cm17.5×10×7.5in | 44.5×27.9×14cm17.5×11×5.5in |
| Laptop | 15" | 16"Best |
| Opening | Roll-top, expandable roll top with Fidlock magnetic buckle, U-shaped back panel zip for top, side and clamshell access | Top-loading, top-loading main compartment under a flap with AustriAlpin COBRA buckle |
| Warranty | Lifetime | No fixed term |
| Organizer | Yes | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | Removable | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | Yes | No |
| Hip belt | Removable | No |
| Sternum strap | Removable | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Material | Challenge Sailcloth Ecopak EPLX600 waterproof laminate (100% post-consumer recycled polyester), RBC 200 lining, YKK zippers | 1050D water-resistant MIL-SPEC ballistic nylon exterior, 1000D water-resistant silver CORDURA lining, YKK AquaGuard zippers |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
Both bags pass and fail the same airline size limits.
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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.