All airlines

Allegiant

G4 AAY United States North America

Carry-on

Size: 22 × 16 × 10 in≈ 55.8 × 40.6 × 25.4 cm

May cost extra.

Personal item

Size: 18 × 14 × 8 in≈ 45.7 × 35.5 × 20.3 cm

The carry-on is a paid extra.

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This size was read off Allegiant's own page, not copied from a list, and the link to it is above.

That page is the authority, always. Sizes change, they vary by aircraft and route, and a gate agent measures the bag in front of them.

Figures are the airline's own, in the units it publishes. Switch to cm or in and we convert them for you, marked with ≈. We round those down, never to nearest, so a bag that fits by our numbers fits by the airline's too.