Rains Rolltop Rucksack vs Tom Bihn Synapse 19
The Rains Rolltop Rucksack is 19L and 0.78kg1.7lb; the Tom Bihn Synapse 19 is 19L and 0.7kg1.5lb. The Tom Bihn Synapse 19 is 0.08kg0.2lb lighter. The Rains Rolltop Rucksack costs $105 less. The Rains Rolltop Rucksack fits the carry-on limit of 36 of 36 major airlines and the Tom Bihn Synapse 19 fits 36; under the seat, 0 and 8 of 26.
| Spec | Rains Rolltop Rucksack | Tom Bihn Synapse 19 |
|---|---|---|
| Price | $150Best | $255 |
| Volume | 19L | 19L |
| Weight | 0.78kg1.7lb | 0.7kg1.5lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 31%Best |
| Dimensions | 48×32×11cm19×12.5×4.5in | 41×29×20cm16×11.5×8in |
| Laptop | 16"Best | 13" |
| Compartments | 1 | 6 |
| Bottle pockets | n/a | 1 |
| Compression straps | n/a | 0 |
| Opening | Roll-top, roll top with carabiner | Panel access, half-zip |
| Warranty | 2 years | Lifetime |
| Organizer | Yes | 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 | No | Yes |
| Sternum strap | Yes | Removable |
| Load lifters | No | No |
| Shoulder strap | No | Yes |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | Rains signature waterproof PU-coated polyester (100% PES), 8,000 mm water column | 420d Spectron ripstop exterior (default), 210d Cerylon interior, closed-cell foam back panel |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Rains Rolltop Rucksack | Tom Bihn Synapse 19 |
|---|---|---|---|
| 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 |
| JetBlue Airways | Personal item | Too big | Fits |
| LATAM Airlines | Personal item | Too big | Fits |
| Volaris | Personal item | 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.