Aer Fit Pack 3 vs Kapten & Son Bali Medium 18L
The Aer Fit Pack 3 is 18.7L and 1.1kg2.4lb; the Kapten & Son Bali Medium 18L is 18L and 1.1kg2.4lb. They weigh the same. The Aer Fit Pack 3 fits the carry-on limit of 36 of 36 major airlines and the Kapten & Son Bali Medium 18L fits 36; under the seat, 7 and 7 of 26.
| Spec | Aer Fit Pack 3 | Kapten & Son Bali Medium 18L |
|---|---|---|
| Price | $149 | n/a |
| Volume | 18.7L | 18L |
| Weight | 1.1kg2.4lb | 1.1kg2.4lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27% | 27% |
| Dimensions | 44×32×20cm17.5×12.5×8in | 44×27×12cm17.5×10.5×4.5in |
| Laptop | 16"Best | 15.6" |
| Bottle pockets | 2 | n/a |
| Opening | Panel access, front panel | Zipper |
| Warranty | Lifetime | n/a |
| Organizer | Yes | Yes |
| Shoe compartment | Yes | 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 | Yes | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | 1680D Cordura ballistic nylon | 50% recycled PET, 40% PU, 10% polyester |
| Last checked | 2026-09 | 2026-10 |
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.