Think Tank DarkLight 25L vs Timbuk2 Clark Commuter Backpack
The Think Tank DarkLight 25L is 25L and 1.82kg4lb; the Timbuk2 Clark Commuter Backpack is 26L and 1.83kg4lb. The Think Tank DarkLight 25L is 0.01kg0lb lighter. The Think Tank DarkLight 25L costs $29.25 less. The Think Tank DarkLight 25L fits the carry-on limit of 14 of 36 major airlines and the Timbuk2 Clark Commuter Backpack fits 35; under the seat, 0 and 0 of 26.
| Spec | Think Tank DarkLight 25L | Timbuk2 Clark Commuter Backpack |
|---|---|---|
| Price | $239.75Best | $269 |
| Volume | 25L | 26L |
| Expands to | n/a | 30L |
| Weight | 1.82kg4lbBest | 1.83kg4lb |
| Carry-on compliance | 39% | 97%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 52×30.5×24.1cm20.5×12×9.5in | 50.5×34×11.5cm20×13.5×4.5in |
| Laptop | 16"Best | 15" |
| Bottle pockets | 1 | n/a |
| Opening | Panel access, back panel + top | Roll-top, Double roll-top |
| Warranty | Lifetime | Lifetime |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | Yes |
| Rain cover | Yes | Removable |
| MOLLE | Yes | No |
| Hip belt | Removable | Removable |
| Sternum strap | No | Removable |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | Yes | No |
| Bike-ready | No | No |
| Material | 600D polyester PU, 1680D ballistic nylon, PFC-free DWR | Eco Cordura 1200 x 1500D recycled polyester with a water-resistant drop liner |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Think Tank DarkLight 25L | Timbuk2 Clark Commuter Backpack |
|---|---|---|---|
| Air Arabia | Carry-on | Too big | Fits |
| Air Canada | Carry-on | Too big | Fits |
| Air India | Carry-on | Too big | Fits |
| AirAsia | Carry-on | Too big | Fits |
| Alaska Airlines | Carry-on | Too big | Fits |
| American Airlines | Carry-on | Too big | Fits |
| Cebu Pacific | Carry-on | Too big | Fits |
| Delta Air Lines | Carry-on | Too big | Fits |
| Emirates | Carry-on | Too big | Fits |
| JetBlue Airways | Carry-on | Too big | Fits |
| Lufthansa | Carry-on | Too big | Fits |
| Norwegian Air Shuttle | Carry-on | Too big | Fits |
| Qantas | Carry-on | Too big | Fits |
| Ryanair | Carry-on | Too big | Fits |
| SAS | Carry-on | Too big | Fits |
| Turkish Airlines | Carry-on | Too big | Fits |
| United Airlines | Carry-on | Too big | Fits |
| Vietjet Air | Carry-on | Too big | Fits |
| Vueling | Carry-on | Too big | Fits |
| WestJet | Carry-on | Too big | Fits |
| Wizz Air | 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.