Freitag F253 Kowalski vs Lowe Alpine AirZone Active 18
The Freitag F253 Kowalski is 18L and 0.74kg1.6lb; the Lowe Alpine AirZone Active 18 is 18L and 0.77kg1.7lb. The Freitag F253 Kowalski is 0.03kg0.1lb lighter. The Freitag F253 Kowalski fits the carry-on limit of 36 of 36 major airlines and the Lowe Alpine AirZone Active 18 fits 31; under the seat, 7 and 0 of 26.
| Spec | Freitag F253 Kowalski | Lowe Alpine AirZone Active 18 |
|---|---|---|
| Price | $300 | n/a |
| Volume | 18L | 18L |
| Weight | 0.74kg1.6lbBest | 0.77kg1.7lb |
| Carry-on compliance | 100%Best | 86% |
| Personal-item compliance | 27%Best | 0% |
| Dimensions | 38×33.5×11cm15×13×4.5in | 52×27×21cm20.5×10.5×8.5in |
| Laptop | 16" | no laptop sleeve |
| Bottle pockets | n/a | 2 |
| Opening | n/a | Clamshell |
| Torso length | n/a | 46cm (18in) |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | Yes |
| Water-resistant | No | No |
| Rain cover | No | Yes |
| MOLLE | No | No |
| Hip belt | No | Yes |
| Sternum strap | No | Yes |
| Load lifters | No | Yes |
| 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 | 210D nylon 6.6 mini ripstop, HydroShield-coated |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Freitag F253 Kowalski | Lowe Alpine AirZone Active 18 |
|---|---|---|---|
| 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 |
| Frontier Airlines | Personal item | Fits | Too big |
| LATAM Airlines | Personal item | Fits | Too big |
| Qatar Airways | Carry-on | 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.