Southwest personal item size checker

Southwest publishes no official personal item size; it just has to fit under the seat, and about 16.25 x 13.5 x 8 inches is the commonly cited fit. A carry-on can be up to 24 x 16 x 10 inches and is free on most fares.

Checked October 2026. See the full Southwest bag fees and rules.

Quick answers

What size is a personal item on Southwest?

Southwest doesn't publish one. It must fit under the seat; about 16.25 x 13.5 x 8 inches is the commonly cited fit.

What size carry-on does Southwest allow?

Up to 24 x 16 x 10 inches.

Is a backpack a personal item on Southwest?

Yes, if it fits within 16.25 x 13.5 x 8 inches and under the seat. Measure it packed, with straps and pockets.

Other airlines: Frontier, United, American, Allegiant, JetBlue, Delta, Alaska.