Briggs & Riley ZDX Global 21" Carry-On Expandable Spinner: 21 x 15 x 9 in
international carry-on, softside, 4 spinner wheels, 8 lb empty. Exterior figures are the maker's own, wheels and handles included.
Cabin approved at 8 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.
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Does the ZDX fit? All 19 airlines
21 x 15 x 9 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 (21 x 15 x 11 in) and clears 1 of 19 airlines instead of 8. Expanded, it flips to gate check on Allegiant Air, British Airways, Frontier Airlines, Southwest Airlines, Lufthansa, Turkish Airlines, Air Canada. Fly with it zipped shut.
| Airline | Cabin max (in) | Verdict | Under seat |
|---|---|---|---|
| Allegiant Air | 22 x 16 x 10 | Cabin approved1 in to spare | No |
| British Airways | 22 x 18 x 10 | Cabin approved1 in to spare | No |
| Frontier Airlines | 24 x 16 x 10 | Cabin approved1 in to spare | No |
| Southwest Airlines | 24 x 16 x 10 | Cabin approved1 in to spare | not published |
| Sun Country Airlines | 24 x 16 x 11 | Cabin approved1 in to spare | No |
| Lufthansa | 21.65 x 15.75 x 9.06 | Tight squeeze0.1 in to spare | No |
| Turkish Airlines | 21.65 x 15.75 x 9.06 | Tight squeeze0.1 in to spare | No |
| Air Canada | 21.5 x 15.5 x 9 | Tight squeeze0 in to spare | No |
| Emirates | 21.65 x 14.96 x 8.66 | Gate check0.3 in over | not published |
| Alaska Airlines | 22 x 14 x 9 | Gate check1 in over | not published |
| American Airlines | 22 x 14 x 9 | Gate check1 in over | No |
| Avelo Airlines | 22 x 14 x 9 | Gate check1 in over | No |
| Delta Air Lines | 22 x 14 x 9 | Gate check1 in over | not published |
| Hawaiian Airlines | 22 x 14 x 9 | Gate check1 in over | not published |
| JetBlue Airways | 22 x 14 x 9 | Gate check1 in over | No |
| United Airlines | 22 x 14 x 9 | Gate check1 in over | No |
| Ryanair | 21.65 x 15.75 x 7.87 | Gate check1.1 in over | No |
| Air France | 21.7 x 13.8 x 9.9 | Gate check1.2 in over | No |
| Qatar Airways | 19.69 x 14.57 x 9.84 | Gate check1.3 in over | not published |
Bag spec source: briggs-riley.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.
Briggs & Riley publishes two dimension sets for each wheeled bag: Exterior Dimensions (includes wheels & handles) and Case Dimensions (excludes wheels & handles). The exterior set is the overall gate sizer measurement and is stored in exterior; the case set is stored in bodyOnly. Depths are listed as a compressed to expanded range, so the stored exterior depth is the compressed value and expandedDepthIn is the expanded value. All dimensions are published in inches with cm secondary.
All 13 Briggs & Riley bags
