Monos Metro Backpack: 16.5 x 11.2 x 6 in
personal-item, backpack, no wheels, 2.7 lb empty. Exterior figures are the maker's own.
Under the seat at 7 of 13 airlines with a published limit
The table below shows the verdict at every airline, best fit first, using the same math as the live fit checker.
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Does the Metro Backpack fit? All 19 airlines
16.5 x 11.2 x 6 in against each airline's published carry-on box, largest side to largest side, sorted best fit first.
| Airline | Cabin max (in) | Verdict | Under seat |
|---|---|---|---|
| Sun Country Airlines | 24 x 16 x 11 | Cabin approved4.8 in to spare | Yes |
| Allegiant Air | 22 x 16 x 10 | Cabin approved4 in to spare | Yes |
| British Airways | 22 x 18 x 10 | Cabin approved4 in to spare | No |
| Frontier Airlines | 24 x 16 x 10 | Cabin approved4 in to spare | Yes |
| Southwest Airlines | 24 x 16 x 10 | Cabin approved4 in to spare | not published |
| Qatar Airways | 19.69 x 14.57 x 9.84 | Cabin approved3.2 in to spare | not published |
| Lufthansa | 21.65 x 15.75 x 9.06 | Cabin approved3.1 in to spare | No |
| Turkish Airlines | 21.65 x 15.75 x 9.06 | Cabin approved3.1 in to spare | No |
| Air Canada | 21.5 x 15.5 x 9 | Cabin approved3 in to spare | Yes |
| Alaska Airlines | 22 x 14 x 9 | Cabin approved2.8 in to spare | not published |
| American Airlines | 22 x 14 x 9 | Cabin approved2.8 in to spare | Yes |
| Avelo Airlines | 22 x 14 x 9 | Cabin approved2.8 in to spare | Yes |
| Delta Air Lines | 22 x 14 x 9 | Cabin approved2.8 in to spare | not published |
| Hawaiian Airlines | 22 x 14 x 9 | Cabin approved2.8 in to spare | not published |
| JetBlue Airways | 22 x 14 x 9 | Cabin approved2.8 in to spare | Yes |
| United Airlines | 22 x 14 x 9 | Cabin approved2.8 in to spare | No |
| Emirates | 21.65 x 14.96 x 8.66 | Cabin approved2.7 in to spare | not published |
| Air France | 21.7 x 13.8 x 9.9 | Cabin approved2.6 in to spare | No |
| Ryanair | 21.65 x 15.75 x 7.87 | Cabin approved1.9 in to spare | No |
Bag spec source: monos.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.
Monos publishes both imperial (inches) and metric (centimeters) dimensions on every product page, and each hardside suitcase page explicitly states that the listed exterior measurements include the wheels and fixed handles, meaning these are overall, gate sizer style dimensions rather than body only. Monos does not publish a separate body only figure for any line checked, and its two soft sided Metro bags do not carry this wheel inclusion note since they have no wheels.
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