Billykirk No. 642 Small Carryall vs Monos Metro Duffel
The Billykirk No. 642 Small Carryall is 17.3L and 1.47kg3.2lb; the Monos Metro Duffel is 19.6L and 1.59kg3.5lb. The Billykirk No. 642 Small Carryall is 0.12kg0.3lb lighter. The Monos Metro Duffel costs $350 less. The Billykirk No. 642 Small Carryall fits the carry-on limit of 36 of 36 major airlines and the Monos Metro Duffel fits 36; under the seat, 7 and 8 of 26.
| Spec | Billykirk No. 642 Small Carryall | Monos Metro Duffel |
|---|---|---|
| Price | $575 | $225Best |
| Volume | 17.3L | 19.6L |
| Weight | 1.47kg3.2lbBest | 1.59kg3.5lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27% | 31%Best |
| Dimensions | 27.9×43.2×17.8cm11×17×7in | 28.4×41.4×18.3cm11×16.5×7in |
| Laptop | n/a | 15" |
| Warranty | 5 years | n/a |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | Yes | Yes |
| Luggage pass-through | No | Yes |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | Pendleton Wool by Pendleton Woolen Mills, premium olive vegetable-tanned full-grain leather, nickel-plated solid brass hardware | Nylon twill with ultra-microfibre vegan leather accents (also sold in all vegan leather) |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Billykirk No. 642 Small Carryall | Monos Metro Duffel |
|---|---|---|---|
| JetBlue Airways | Personal item | 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.