Peak Design Travel Backpack 45L: 22 x 13 x 9.5 in
45L, backpack, no wheels, 4.5 lb empty. Exterior figures are the maker's own.
Cabin approved at 5 of 19 airlines
The table below shows the verdict at every airline, best fit first, using the same math as the live fit checker. For why so many carry-ons fail the US standard box, see our 22 x 14 x 9 breakdown.
As an Amazon Associate we earn from qualifying purchases. Links are affiliate links; it costs you nothing extra.
Does the Travel Backpack fit? All 19 airlines
22 x 13 x 9.5 in against each airline's published carry-on box, largest side to largest side, sorted best fit first.
Expansion warning: zipped open, this bag runs 11 in deep (22 x 13 x 11 in) and clears 1 of 19 airlines instead of 5. Expanded, it flips to gate check on Frontier Airlines, Southwest Airlines, Allegiant Air, British Airways. Fly with it zipped shut.
| Airline | Cabin max (in) | Verdict | Under seat |
|---|---|---|---|
| Sun Country Airlines | 24 x 16 x 11 | Cabin approved1.5 in to spare | No |
| Frontier Airlines | 24 x 16 x 10 | Tight squeeze0.5 in to spare | No |
| Southwest Airlines | 24 x 16 x 10 | Tight squeeze0.5 in to spare | not published |
| Allegiant Air | 22 x 16 x 10 | Tight squeeze0 in to spare | No |
| British Airways | 22 x 18 x 10 | Tight squeeze0 in to spare | No |
| Air France | 21.7 x 13.8 x 9.9 | Gate check0.3 in over | No |
| Lufthansa | 21.65 x 15.75 x 9.06 | Gate check0.4 in over | No |
| Turkish Airlines | 21.65 x 15.75 x 9.06 | Gate check0.4 in over | No |
| Air Canada | 21.5 x 15.5 x 9 | Gate check0.5 in over | No |
| Alaska Airlines | 22 x 14 x 9 | Gate check0.5 in over | not published |
| American Airlines | 22 x 14 x 9 | Gate check0.5 in over | No |
| Avelo Airlines | 22 x 14 x 9 | Gate check0.5 in over | No |
| Delta Air Lines | 22 x 14 x 9 | Gate check0.5 in over | not published |
| Hawaiian Airlines | 22 x 14 x 9 | Gate check0.5 in over | not published |
| JetBlue Airways | 22 x 14 x 9 | Gate check0.5 in over | No |
| United Airlines | 22 x 14 x 9 | Gate check0.5 in over | No |
| Emirates | 21.65 x 14.96 x 8.66 | Gate check0.8 in over | not published |
| Ryanair | 21.65 x 15.75 x 7.87 | Gate check1.6 in over | No |
| Qatar Airways | 19.69 x 14.57 x 9.84 | Gate check2.3 in over | not published |
Bag spec source: peakdesign.com · accessed 2026-07-09. Airline limits come from each carrier's official baggage page; open an airline above for its citations. Policies change, so verify a borderline case before you fly.
Peak Design lists a separate exterior (external) and interior dimension set for each bag, given in centimeters with the inch equivalent in parentheses. The Travel Backpack sizes are expandable, so the page gives a standard unexpanded exterior and an expanded exterior; the exterior field here stores the standard unexpanded size and expandedDepthIn stores the expanded depth. Travel Duffels do not expand, and none of these bags have wheels or a rigid frame, so the published exterior is the soft bag body.
All 8 Peak Design bags
