Kapten & Son Oslo 18L vs Lowepro Adventura BP 300 III
The Kapten & Son Oslo 18L is 18L and 1.1kg2.4lb; the Lowepro Adventura BP 300 III is 18L and 1.11kg2.4lb. The Kapten & Son Oslo 18L is 0.01kg0lb lighter. The Kapten & Son Oslo 18L fits the carry-on limit of 36 of 36 major airlines and the Lowepro Adventura BP 300 III fits 36; under the seat, 7 and 1 of 26.
| Spec | Kapten & Son Oslo 18L | Lowepro Adventura BP 300 III |
|---|---|---|
| Price | n/a | $129 |
| Volume | 18L | 18L |
| Weight | 1.1kg2.4lbBest | 1.11kg2.4lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27%Best | 4% |
| Dimensions | 45×29×13cm17.5×11.5×5in | 46×31.5×20cm18×12.5×8in |
| Laptop | 15.6"Best | 13" |
| Bottle pockets | n/a | 2 |
| Opening | Zipper | Panel access, front access |
| Organizer | Yes | No |
| 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 | No |
| Camera compartment | No | Yes |
| Material | 71% recycled PET, 26% PU, 3% polyester | 1680D ballistic polyester, 600D polyester |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Kapten & Son Oslo 18L | Lowepro Adventura BP 300 III |
|---|---|---|---|
| Allegiant Air | Personal item | Fits | Too big |
| American Airlines | Personal item | Fits | Too big |
| British Airways | Personal item | Fits | Too big |
| easyJet | Personal item | Fits | Too big |
| LATAM Airlines | Personal item | Fits | Too big |
| Volaris | Personal item | Fits | Too big |
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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.