Tom Bihn Synapse 25 vs Waterfly Adventure Aether Backpack 25L
The Tom Bihn Synapse 25 is 25L and 0.8kg1.8lb; the Waterfly Adventure Aether Backpack 25L is 25L and 0.8kg1.8lb. They weigh the same. The Waterfly Adventure Aether Backpack 25L costs $225.01 less. The Tom Bihn Synapse 25 fits the carry-on limit of 30 of 36 major airlines and the Waterfly Adventure Aether Backpack 25L fits 36; under the seat, 0 and 0 of 26.
| Spec | Tom Bihn Synapse 25 | Waterfly Adventure Aether Backpack 25L |
|---|---|---|
| Price | $265 | $39.99Best |
| Volume | 25L | 25L |
| Weight | 0.8kg1.8lb | 0.8kg1.8lb |
| Carry-on compliance | 83% | 100%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 51×34×23cm20×13.5×9in | 47×31×16cm18.5×12×6.5in |
| Laptop | 16" | 16" |
| Compartments | 6 | n/a |
| Bottle pockets | 1 | 2 |
| Compression straps | 0 | n/a |
| Opening | Panel access, half-zip | Zippered main compartment with two-way zippers |
| Warranty | Lifetime | 10 years |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Yes | No |
| Sternum strap | Yes | Yes |
| Load lifters | No | No |
| Shoulder strap | Yes | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 420d Spectron ripstop exterior (default), 200d Halcyon interior (bluesign/OEKO-TEX certified) | Polyester, polyester lining |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Tom Bihn Synapse 25 | Waterfly Adventure Aether Backpack 25L |
|---|---|---|---|
| Air Arabia | Carry-on | Too big | Fits |
| Air India | Carry-on | Too big | Fits |
| Emirates | Carry-on | Too big | Fits |
| Qatar Airways | Carry-on | Too big | Fits |
| Ryanair | Carry-on | 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.