Timbuk2 Never Check Expandable Backpack vs Tom Bihn Trinity
The Timbuk2 Never Check Expandable Backpack is 21L and 1.2kg2.6lb; the Tom Bihn Trinity is 21L and 1.26kg2.8lb. The Timbuk2 Never Check Expandable Backpack is 0.06kg0.1lb lighter. The Timbuk2 Never Check Expandable Backpack costs $196 less. The Timbuk2 Never Check Expandable Backpack fits the carry-on limit of 36 of 36 major airlines and the Tom Bihn Trinity fits 1; under the seat, 0 and 0 of 26.
| Spec | Timbuk2 Never Check Expandable Backpack | Tom Bihn Trinity |
|---|---|---|
| Price | $249Best | $445 |
| Volume | 21L | 21L |
| Expands to | 25L | n/a |
| Weight | 1.2kg2.6lbBest | 1.26kg2.8lb |
| Carry-on compliance | 100%Best | 3% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 48×29×15cm19×11.5×6in | 27×41×29cm10.5×16×11.5in |
| Laptop | 15" | sleeve, size not published |
| Bottle pockets | 1 | n/a |
| Compression straps | 0 | n/a |
| Opening | n/a | Clamshell, Two clamshell compartments |
| Warranty | Lifetime | Lifetime |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | Removable |
| Luggage pass-through | No | Yes |
| Camera compartment | No | No |
| Material | 420D x 2000D Cordura | bluesign certified 630d High-Tenacity 2x2 ballistic nylon exterior, 200d Halcyon nylon ripstop interior, YKK water-repellent zippers |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Timbuk2 Never Check Expandable Backpack | Tom Bihn Trinity |
|---|---|---|---|
| Air Arabia | Carry-on | Fits | Too big |
| Air Canada | Carry-on | Fits | Too big |
| Air France | Carry-on | Fits | Too big |
| Air India | Carry-on | Fits | Too big |
| AirAsia | Carry-on | Fits | Too big |
| Alaska Airlines | Carry-on | Fits | Too big |
| Allegiant Air | Carry-on | Fits | Too big |
| American Airlines | Carry-on | Fits | Too big |
| ANA (All Nippon Airways) | Carry-on | Fits | Too big |
| Avianca | Carry-on | Fits | Too big |
| British Airways | Carry-on | Fits | Too big |
| Cebu Pacific | Carry-on | Fits | Too big |
| Delta Air Lines | Carry-on | Fits | Too big |
| easyJet | Carry-on | Fits | Too big |
| Emirates | Carry-on | Fits | Too big |
| Frontier Airlines | Carry-on | Fits | Too big |
| Gol Linhas Aereas | Carry-on | Fits | Too big |
| IndiGo | Carry-on | Fits | Too big |
| JetBlue Airways | Carry-on | Fits | Too big |
| KLM | Carry-on | Fits | Too big |
| LATAM Airlines | Carry-on | Fits | Too big |
| Lufthansa | Carry-on | Fits | Too big |
| Norwegian Air Shuttle | Carry-on | Fits | Too big |
| Qantas | Carry-on | Fits | Too big |
| Qatar Airways | Carry-on | Fits | Too big |
| Ryanair | Carry-on | Fits | Too big |
| SAS | Carry-on | Fits | Too big |
| Southwest Airlines | Carry-on | Fits | Too big |
| Turkish Airlines | Carry-on | Fits | Too big |
| United Airlines | Carry-on | Fits | Too big |
| Vietjet Air | Carry-on | Fits | Too big |
| Volaris | Carry-on | Fits | Too big |
| Vueling | Carry-on | Fits | Too big |
| WestJet | Carry-on | Fits | Too big |
| Wizz Air | 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.