Côte&Ciel Isar S vs Lowepro Flipside Trek BP 250 AW
The Côte&Ciel Isar S is 12.5L and 0.98kg2.2lb; the Lowepro Flipside Trek BP 250 AW is 12L and 1.06kg2.3lb. The Côte&Ciel Isar S is 0.08kg0.2lb lighter. The Lowepro Flipside Trek BP 250 AW costs $91 less. The Côte&Ciel Isar S fits the carry-on limit of 31 of 36 major airlines and the Lowepro Flipside Trek BP 250 AW fits 36; under the seat, 0 and 7 of 26.
| Spec | Côte&Ciel Isar S | Lowepro Flipside Trek BP 250 AW |
|---|---|---|
| Price | $330 | $239Best |
| Volume | 12.5L | 12L |
| Expands to | 17.5L | n/a |
| Weight | 0.98kg2.2lbBest | 1.06kg2.3lb |
| Carry-on compliance | 86% | 100%Best |
| Personal-item compliance | 0% | 27%Best |
| Dimensions | 53×26×21cm21×10×8.5in | 44×25.5×17cm17.5×10×6.5in |
| Laptop | 13" | no laptop sleeve |
| Compartments | n/a | 2 |
| Opening | zipped front pocket, separate back compartment with padded laptop pocket | Panel access, body-side + top |
| Warranty | 1 year | n/a |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | Yes |
| 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 | Yes |
| Material | EcoYarn polyester, black interior, black metallic trims | nylon |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Côte&Ciel Isar S | Lowepro Flipside Trek BP 250 AW |
|---|---|---|---|
| Air Arabia | Carry-on | Too big | Fits |
| Air India | Carry-on | Too big | Fits |
| Allegiant Air | Personal item | Too big | Fits |
| American Airlines | Personal item | Too big | Fits |
| British Airways | Personal item | Too big | Fits |
| easyJet | Personal item | Too big | Fits |
| Frontier Airlines | Personal item | Too big | Fits |
| LATAM Airlines | Personal item | Too big | Fits |
| Qatar Airways | Carry-on | Too big | Fits |
| Ryanair | Carry-on | Too big | Fits |
| Volaris | Personal item | Too big | Fits |
| Vueling | Carry-on | Too big | Fits |
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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.