Best free personal item size for US airlines
The under-seat personal item that’s free on every US airline — including Spirit and Frontier.
Best personal item size
41 × 33 × 18 cm
16.1 × 13 × 7.1 in
largest × middle × shortest side
Fits the personal item allowance on all 6 airlines in this group. The tightest is Allegiant Air.
Bags that fit
personal item limit per airline (6)
| Airline | Limit | Weight |
|---|---|---|
| Allegiant Air | 41 × 38 × 18 cm | — |
| Breeze Airways | 43 × 33 × 20 cm | — |
| Avelo Airlines | 43 × 33 × 22 cm | — |
| Sun Country | 43 × 33 × 23 cm | — |
| Spirit Airlines | 46 × 36 × 20 cm | — |
| Frontier Airlines | 46 × 36 × 20 cm | — |
FAQ
What is the best personal item size for this group?+
A bag no larger than 41 × 33 × 18 cm (16.1 × 13 × 7.1 in) fits the personal item allowance on all 6 airlines in this group — the limit is set by Allegiant Air.
Why not just buy the biggest bag?+
Because the strictest airline in the group wins. A bag that fits Allegiant Air fits everyone here; a larger one would be rejected or charged there. Buy for the tightest limit and you’re safe on all.
Should I leave a safety margin?+
Yes — measure with wheels and handles, and pick a bag a touch under the limit. A packed bag bulges, and low-cost airlines measure strictly at the gate.