Freitag F253 Kowalski vs Rab Airox 18L Day Pack
The Freitag F253 Kowalski is 18L and 0.74kg1.6lb; the Rab Airox 18L Day Pack is 18L and 0.73kg1.6lb. The Rab Airox 18L Day Pack is 0.01kg0lb lighter. The Rab Airox 18L Day Pack costs $135 less. The Freitag F253 Kowalski fits the carry-on limit of 36 of 36 major airlines and the Rab Airox 18L Day Pack fits 31; under the seat, 7 and 0 of 26.
| Spec | Freitag F253 Kowalski | Rab Airox 18L Day Pack |
|---|---|---|
| Price | $300 | $165Best |
| Volume | 18L | 18L |
| Weight | 0.74kg1.6lb | 0.73kg1.6lbBest |
| Carry-on compliance | 100%Best | 86% |
| Personal-item compliance | 27%Best | 0% |
| Dimensions | 38×33.5×11cm15×13×4.5in | 50×29×23cm19.5×11.5×9in |
| Laptop | 16" | n/a |
| Opening | n/a | Panel access, Panel loader with zipped entry |
| Warranty | n/a | Lifetime |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | No |
| Water-resistant | No | No |
| Rain cover | No | Yes |
| MOLLE | No | No |
| Hip belt | No | Yes |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | Used truck tarpaulin (polyester/PVC), 100% upcycled, recycled PET lining | 140D nylon (69% recycled) with yarn dyed nylon 210D rip stop, 420D Nylon secondary, Embossed 200d Polyester lining (100% recycled) |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Freitag F253 Kowalski | Rab Airox 18L Day Pack |
|---|---|---|---|
| Air Arabia | Carry-on | Fits | Too big |
| Air India | Carry-on | Fits | Too big |
| 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 |
| Emirates | Carry-on | Fits | Too big |
| Frontier Airlines | Personal item | Fits | Too big |
| LATAM Airlines | Personal item | Fits | Too big |
| Ryanair | Carry-on | Fits | Too big |
| Volaris | Personal item | Fits | Too big |
| Vueling | Carry-on | 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.