Kapten & Son Tromso Small 9L vs Rains Book Daypack
The Kapten & Son Tromso Small 9L is 9L and 0.8kg1.8lb; the Rains Book Daypack is 10.5L and 0.73kg1.6lb. The Rains Book Daypack is 0.07kg0.2lb lighter. The Kapten & Son Tromso Small 9L fits the carry-on limit of 36 of 36 major airlines and the Rains Book Daypack fits 36; under the seat, 22 and 22 of 26.
| Spec | Kapten & Son Tromso Small 9L | Rains Book Daypack |
|---|---|---|
| Price | n/a | $150 |
| Volume | 9L | 10.5L |
| Weight | 0.8kg1.8lb | 0.73kg1.6lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 85% | 85% |
| Dimensions | 31×26×9.5cm12×10×3.5in | 40×27×10cm15.5×10.5×4in |
| Laptop | no laptop sleeve | 15" |
| Compartments | n/a | 1 |
| Opening | Flap with magnet and zip | coated zip closure |
| Warranty | n/a | 2 years |
| 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 | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 60% PU, 40% recycled PET | Rains signature waterproof PU-coated polyester (100% PES), 8,000 mm water column |
| Last checked | 2026-10 | 2026-09 |
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.