Allegiant Air allows a free personal item up to 18 x 14 x 8 in, under the seat in front of you. Put your own bag's measurements in below.
| Personal item maximum | 18 x 14 x 8 in (under the seat in front) |
| Is it free? | Yes — every fare includes one personal item |
| Full-size carry-on | 22 x 16 x 10 in (charged separately) |
| If it does not fit | Airport bag fees apply to oversized personal items and to oversized or excess carry-ons. |
Allegiant CHARGES for the full-size carry-on. Only the personal item is free, and buying bags in advance is cheaper than at the airport.
Every Allegiant passenger gets one personal item free; it must fit completely under the seat in front of you.
At 18 x 14 x 8 in it holds roughly 2016 cubic inches, about 57% of the volume of Allegiant Air's own 22 x 16 x 10 in carry-on. It is the most generous published personal-item allowance in our set.
Worth knowing: 6 of the 23 airlines we track publish no personal-item measurement at all, so a bag chosen against Allegiant Air's stated 18 x 14 x 8 in is being measured against a firmer rule than most carriers give you.
Common small bags measured against Allegiant Air's published 18 x 14 x 8 in limit.
| Bag | Size | On Allegiant Air | Note |
|---|---|---|---|
| 15-inch laptop bag | 15 × 11 × 4 in | Fits, 3 in spare | A slim work bag |
| Small daypack | 17 × 12 × 7 in | Fits, 1 in spare | The commonest personal item |
| Weekender tote | 20 × 13 × 9 in | Too big by 2 in | Often too big for under the seat |
| Compact backpack | 16 × 11 × 6 in | Fits, 2 in spare | Fits almost anywhere |
Allegiant CHARGES for the full-size carry-on. Only the personal item is free, and buying bags in advance is cheaper than at the airport. That makes the personal item the whole of your free allowance, and it is why travellers who fly Allegiant Air regularly buy a bag sized to the under-seat limit rather than a standard carry-on they would have to pay for every flight.
Allegiant Air publishes no cabin weight limit, so in practice the personal item is judged on whether it fits the space rather than what it weighs. You still have to be able to handle it yourself.
Airport bag fees apply to oversized personal items and to oversized or excess carry-ons. Because the overhead bag is charged on Allegiant Air, an over-large personal item is not a free upgrade to the locker — it becomes a paid bag, usually at the most expensive tier because you are buying it at the gate.
Two practical notes that apply on any airline: the under-seat space is smaller in a row with a lifejacket box or an entertainment unit beneath the seat, and a soft bag that compresses will pass where a rigid case of identical stated dimensions will not. Measure with anything strapped to the outside included.
Allegiant Air allows a personal item up to 18 x 14 x 8 in, stowed under the seat in front of you.
Yes. Every Allegiant Air fare includes one personal item. On Allegiant Air it is the ONLY free bag — the full-size carry-on is charged separately.
A purse, small backpack, laptop bag, briefcase or similar. Every Allegiant passenger gets one personal item free; it must fit completely under the seat in front of you.
Airport bag fees apply to oversized personal items and to oversized or excess carry-ons.
The personal item goes under the seat and is free. The carry-on goes in the overhead locker and can be up to 22 x 16 x 10 in, and Allegiant Air charges for it.
Yes — Allegiant Air measures the whole bag, so soft bags that squash down have a real advantage under the seat.