Kapten & Son Oslo 18L vs WaterField Designs Tuck Backpack
The Kapten & Son Oslo 18L is 18L and 1.1kg2.4lb; the WaterField Designs Tuck Backpack is 18.4L and 1.08kg2.4lb. The WaterField Designs Tuck Backpack is 0.02kg0lb lighter. The Kapten & Son Oslo 18L fits the carry-on limit of 36 of 36 major airlines and the WaterField Designs Tuck Backpack fits 36; under the seat, 7 and 9 of 26.
| Spec | Kapten & Son Oslo 18L | WaterField Designs Tuck Backpack |
|---|---|---|
| Price | n/a | $299 |
| Volume | 18L | 18.4L |
| Weight | 1.1kg2.4lb | 1.08kg2.4lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27% | 35%Best |
| Dimensions | 45×29×13cm17.5×11.5×5in | 38×31.8×15.2cm15×12.5×6in |
| Laptop | 15.6" | 16"Best |
| Bottle pockets | n/a | 2 |
| Opening | Zipper | full-grain leather flap with magnetic buckles over zip main compartment |
| Warranty | n/a | Lifetime |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | 71% recycled PET, 26% PU, 3% polyester | 1050D black ballistic nylon or waxed canvas, full-grain leather flap and front panel |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Kapten & Son Oslo 18L | WaterField Designs Tuck Backpack |
|---|---|---|---|
| Air Canada | Personal item | Too big | Fits |
| 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.