REI Co-op Trail 25 Pack vs Tom Bihn Synapse 25
The REI Co-op Trail 25 Pack is 25L and 0.8kg1.8lb; the Tom Bihn Synapse 25 is 25L and 0.8kg1.8lb. They weigh the same. The REI Co-op Trail 25 Pack costs $165 less. The REI Co-op Trail 25 Pack fits the carry-on limit of 36 of 36 major airlines and the Tom Bihn Synapse 25 fits 30; under the seat, 1 and 0 of 26.
| Spec | REI Co-op Trail 25 Pack | Tom Bihn Synapse 25 |
|---|---|---|
| Price | $100Best | $265 |
| Volume | 25L | 25L |
| Weight | 0.8kg1.8lb | 0.8kg1.8lb |
| Carry-on compliance | 100%Best | 83% |
| Personal-item compliance | 4%Best | 0% |
| Dimensions | 46×33×20cm18×13×8in | 51×34×23cm20×13.5×9in |
| Laptop | no laptop sleeve | 16" |
| Compartments | 1 | 6 |
| Bottle pockets | 2 | 1 |
| Compression straps | n/a | 0 |
| Opening | Panel access, top/panel | Panel access, half-zip |
| Warranty | No fixed term | Lifetime |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | No |
| Frame sheet | Yes | No |
| Water-resistant | Yes | Yes |
| Rain cover | Yes | No |
| MOLLE | No | No |
| Hip belt | Removable | Yes |
| Sternum strap | No | Yes |
| Load lifters | No | No |
| Shoulder strap | No | Yes |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 210-denier ripstop nylon; lining: 200-denier recycled polyester; raincover: 70-denier nylon with polyurethane coating (all bluesign approved) | 420d Spectron ripstop exterior (default), 200d Halcyon interior (bluesign/OEKO-TEX certified) |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | REI Co-op Trail 25 Pack | Tom Bihn Synapse 25 |
|---|---|---|---|
| Air Arabia | Carry-on | Fits | Too big |
| Air India | Carry-on | Fits | Too big |
| Emirates | Carry-on | Fits | Too big |
| Frontier Airlines | Personal item | Fits | Too big |
| Qatar Airways | Carry-on | Fits | Too big |
| Ryanair | Carry-on | Fits | Too big |
| Vueling | Carry-on | Fits | Too big |
Add more bags to this comparison
Specs come from each brand's own product page. Fit uses listed dimensions in any orientation. How we score carry-on fit.