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Comparison
Carry-on vs personal item
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| Airline | Carry-on (overhead bin) | Personal item (under seat) |
|---|---|---|
| American Airlines | 22 x 14 x 9 in (56 x 36 x 23 cm) | 18 x 14 x 8 in (45 x 35 x 20 cm) |
| Delta | 22 x 14 x 9 in, 45 linear in max (56 x 35 x 23 cm) | No published maximum size; check the airline |
| United | 22 x 14 x 9 in (56 x 35 x 22 cm) | No published maximum size; check the airline |
| Southwest | 24 x 16 x 10 in | 18.5 x 13.5 x 8.5 in |
| Spirit | 22 x 18 x 10 in (56 x 46 x 25 cm), paid add-on on Value fares | 18 x 14 x 8 in (45 x 35 x 20 cm) |
| JetBlue | 22 x 14 x 9 in (55.9 x 35.6 x 22.9 cm), no weight limit stated | 17 x 13 x 8 in (43.2 x 33 x 20.3 cm) |
What actually separates a carry-on from a personal item?
A carry-on is the bag that goes in the overhead bin above your seat. A personal item is the smaller bag that has to fit entirely under the seat in front of you, things like a purse, a small backpack, or a laptop bag. The two allowances are measured separately, and on most airlines you are entitled to bring one of each without paying extra.
The size gap is real: American Airlines allows 22 x 14 x 9 in overhead but only 18 x 14 x 8 in under the seat, a meaningfully smaller box once you account for how a bag actually packs.
Which allowance is free, and which one costs extra?
On full-service airlines like American, Delta and United, both the carry-on and the personal item are typically included in the fare. Ultra-low-cost carriers flip this: Spirit's cheapest fares do not include the overhead-bin carry-on at all, it has to be purchased separately, while the personal item stays free on every fare. Frontier runs the same structure. If you are booking the cheapest fare class on a budget airline, assume only the personal item is guaranteed and check before you pack a full-size carry-on.
Can a backpack count as a personal item instead of a carry-on?
Yes, as long as it fits the personal item dimensions for that airline. A bag like a small under-seat backpack, listed at 16.9 x 11.4 x 7.5 in, comfortably clears American's 18 x 14 x 8 in and JetBlue's 17 x 13 x 8 in limits. A larger travel backpack built to the 22 x 14 x 9 in carry-on ceiling will not qualify as a personal item on most airlines, since it is sized for the overhead bin instead.
What happens if my personal item is actually carry-on sized?
Gate agents check personal items far less often than carry-ons, but on a full flight or a strict low-cost carrier, an oversized personal item can get flagged and either gate-checked or charged as a carry-on. If you are unsure whether your bag reads as a personal item or a carry-on, measure it against the airline's own number rather than guessing, and see what happens if your carry-on is too big at /guides/what-happens-if-your-carry-on-is-too-big/.
Do international airlines split the two allowances the same way?
The concept carries over, but the numbers do not. European carriers publish their limits in centimeters and often set a combined weight cap across both bags, for example Air France and KLM both cap the cabin bag plus personal item together at 12 kg in Economy. Check the specific carrier's own personal item chart at /reference/personal-item-size-by-airline/ before assuming a US-sized personal item clears an international flight.
The verdict
If you are flying a full-service US airline, pack a 22 x 14 x 9 in carry-on and a separate under-seat bag and you are covered on both allowances for free. If you booked the cheapest fare on a budget carrier, plan around the personal item alone unless you have already paid for a carry-on, and pick a personal item bag sized to the tightest airline you fly regularly rather than the most generous one.
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Frequently asked questions
Can I bring both a carry-on and a personal item on the same flight?
On most full-service airlines, yes, one carry-on for the overhead bin and one personal item for under the seat are both included in the fare. On ultra-low-cost carriers like Spirit and Frontier, the personal item is usually free but the overhead-bin carry-on may need to be purchased separately on the cheapest fare classes, so check your specific fare before you pack two bags.
Is a backpack a personal item or a carry-on?
It depends entirely on its size, not on the fact that it is a backpack. A small under-seat backpack around 16.9 x 11.4 x 7.5 in clears personal item limits on airlines like American and JetBlue. A larger travel backpack built closer to 22 x 14 x 9 in is sized as a carry-on and will not fit under most seats, so it needs to go in the overhead bin instead.
Do budget airlines charge extra for personal items?
Generally no. Spirit and Frontier both keep one personal item free on every fare, including their cheapest tiers. What they charge extra for is the larger overhead-bin carry-on, which is bundled into some fares and sold separately on others, so the personal item is usually the one guaranteed free bag on a budget ticket.
What is the smallest personal item limit among major US airlines?
Among the airlines with a published personal item size on this chart, JetBlue's 17 x 13 x 8 in (43.2 x 33 x 20.3 cm) is the smallest. American, Spirit and Allegiant all publish 18 x 14 x 8 in. Delta, United and Alaska do not publish a maximum personal item size at all, so their own page has to be checked case by case.
Researched from published specifications and airline pages, not hands-on testing. Not professional advice.