Gregory Alpaca 40 vs Topo Designs Mountain Duffel 40L
The Gregory Alpaca 40 is 40L and 1.23kg2.7lb; the Topo Designs Mountain Duffel 40L is 40L and 1.13kg2.5lb. The Topo Designs Mountain Duffel 40L is 0.1kg0.2lb lighter. The Gregory Alpaca 40 fits the carry-on limit of 0 of 36 major airlines and the Topo Designs Mountain Duffel 40L fits 1; under the seat, 0 and 0 of 26.
| Spec | Gregory Alpaca 40 | Topo Designs Mountain Duffel 40L |
|---|---|---|
| Price | n/a | $169 |
| Volume | 40L | 40L |
| Weight | 1.23kg2.7lb | 1.13kg2.5lbBest |
| Carry-on compliance | 0% | 3%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 29×58×34cm11.5×23×13.5in | 26×50.8×30.5cm10×20×12in |
| Laptop | no laptop sleeve | no laptop sleeve |
| Bottle pockets | 0 | n/a |
| Opening | large U-zip opening with #10 YKK zipper | n/a |
| Warranty | 50 years | Lifetime |
| Organizer | Yes | 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 | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | Removable |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | recycled 900D polyester ripstop with TPU weather resistant coating, 135D recycled polyester lining | 200D recycled nylon lightweight ripstop, 400D recycled nylon, 1680D recycled ballistic nylon, matte non-P PVC liner, PFC-free DWR |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Gregory Alpaca 40 | Topo Designs Mountain Duffel 40L |
|---|---|---|---|
| Singapore Airlines | 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.