Spirit personal item size: what fits in the free sizer

Short answer: a Spirit Airlines personal item must fit within 18 × 14 × 8 in. The Jelkin 25 is 25 × 17 × 14 cm (about 9.8 × 6.7 × 5.5 in); its longest side is well under Spirit Airlines's longest allowed dimension of 18 in, and at 14 cm deep it clears any under-seat test, so it qualifies as a free under-seat item.

Spirit includes exactly one bag in the fare: a personal item no larger than 18 × 14 × 8 inches, which is about 45.7 × 35.6 × 20.3 cm, and it has to drop into the sizer at the gate without being forced. Everything bigger — including a full-size carry-on — is an extra charge, and the charge is at its highest when it is applied at the departure gate rather than at booking.

The only bag Spirit includes in the fare

Spirit's published personal item allowance covers a small backpack, a purse, a tote, a laptop bag or a camera bag, provided the whole thing fits in the box. Handles, wheels and external pockets are part of the measurement. If you routinely travel with a wheeled cabin case, budget for it as a separate line item rather than assuming it comes with the ticket.

A diaper bag is generally treated as the personal item on Spirit's list, though it is carried in addition when you are travelling with an infant. Assistive devices, a coat and airside shopping are not counted.

25 × 17 × 14 cm in the Spirit sizer: edge by edge

The bag converts to 9.8 × 6.7 × 5.5 inches. Spirit's box, sorted from smallest to largest, is 8 × 14 × 18 inches. Compare them in that order: 5.5 in against 8 in leaves 2.5 in (6.4 cm) of slack on the depth; 6.7 in against 14 in leaves 7.3 in (18.5 cm) on the width; 9.8 in against 18 in leaves 8.2 in (20.8 cm) on the length.

Every edge clears. The depth is the one with least room, and the bag needs to go in with its 9.8-inch length along the 18-inch axis — flat, not on end. Nothing about a 25 cm bag will catch on a Spirit sizer in that orientation.

Same dimensions as American, very different enforcement

American publishes the same 18 × 14 × 8 inch figure for its personal item, but in practice American is mostly concerned with whether the overhead piece fits in the bin. Spirit checks. The sizer sits at the gate, agents use it, and the fee for a bag that does not fit is applied there and then.

That difference is the whole reason to plan around the free bag on Spirit. The allowance is not unusually tight — it is unusually enforced, which is not the same thing.

What a rigid sizer does to a padded bag

A padded bag behaves well in a sizer if it is packed flat and badly if it is packed round. The filling compresses under a strap, but only so far, and a hard object in the middle of the load will hold the panel out. Put rigid items — sunglasses case, power bank, camera — flat against the base in a single layer, then fill above them with soft things. Close the turn-lock and check the profile from the side before you leave the house.

One advantage of a structured opening: the bag holds that flat profile instead of slumping into a dome, so the measurement you take at home is the measurement the agent sees.

What to put in the free personal item

Documents and medication first, then the electronics layer: phone, a short cable and a power bank. After that, the in-flight layer — earbuds, a packable jacket, and something to read. Spirit's cabins are slimline seats with no seat-back entertainment, so a downloaded film on a phone or an iPad Mini is the realistic option, and both fit flat in a 25 cm bag.

What does not fit is a 13-inch laptop, which is the honest limit of a bag this size. The cards, keys and phone breakdown and the empty weight figures cover what you can carry and what it costs you.

Paying early, and one habit at the gate

The same bag costs least when you add it during booking, more when you add it later online, and most at the airport or the gate. If you know you will want an overhead bag, decide before you get to the terminal. If a fee is charged in error or you think the bag fits, ask for a re-check at the sizer rather than arguing from the measurement printed on the bag.

Then measure it packed, the night before, with a tape: width, height and depth at the front panel where the turn-lock sits. Write the three numbers in your phone and put the bag in the sizer yourself, handle down, rather than waiting to be told. The Jelkin 25 Cloud Bag in lilas measures 9.8 × 6.7 × 5.5 in — inside 18 × 14 × 8 in on every edge, with 2.5 in of slack on the depth. For the wider picture, the airline personal item comparison and the guide to using it as your personal item cover every carrier in the group.

Allowances change with route, fare type, season and aircraft. The figures below were checked against the airline’s public baggage pages in October 2026 and are given as a guide only — always confirm on the airline’s own site before you fly, and measure your bag packed rather than empty. CloudFlirty is not affiliated with any airline mentioned here.

Frequently asked questions

Does a 25 × 17 × 14 cm bag fit Spirit's free personal item sizer?

Yes. Every edge is smaller than Spirit's 18 × 14 × 8 inch box, with 2.5 inches of slack on the depth.

Is a carry-on included with a Spirit ticket?

No. The carry-on is a paid extra on Spirit; the personal item is the only bag included in the base fare.

Is there a weight limit for the personal item?

Spirit does not publish a separate figure for the personal item; the practical test is the sizer. Weight limits apply to checked and some carry-on bags.

Can I use a backpack as the personal item?

Yes, if the whole backpack drops into the sizer without being forced. Soft, unpadded backpacks are easier than structured ones.

What is the most expensive way to pay for a bag?

At the gate. Add the bag when you book, or at least before you reach the airport.

Check it against the others: the airline personal item size checker puts this allowance next to 18 other carriers and tells you whether a 25 × 17 × 14 cm bag passes.

Questions people ask

What is Spirit Airlines' personal item size?

18 × 14 × 8 in. It must fit under the seat in front of you and is free in addition to your carry-on on qualifying fares.

Does a 25 × 17 × 14 cm (9.8 × 6.7 × 5.5 in) bag fit Spirit Airlines?

Yes. The bag's longest side is about 9.8 in, shorter than Spirit Airlines's longest allowed dimension, and at 14 cm deep it sits well under any under-seat test, so it drops in with room to spare.

Does the limit include handles and wheels?

Yes. Spirit Airlines's personal-item figure is the outside of the bag including handles and wheels.