Personal Item vs Carry-On: 1 Key Difference

A personal item is the small bag that fits under the seat in front of you, a purse, laptop bag, or small backpack. A carry-on is the larger bag that goes in the overhead bin. That's the core distinction, and it holds across essentially every airline, even ones that disagree wildly on size limits or pricing.

Everything else, whether it's free, how big it can be, whether your fare even includes one, varies by airline. But the under-the-seat versus overhead-bin split is close to universal.

That said, the exact boundary between under-the-seat and overhead-bin sized is set entirely by the airline, not by any shared industry definition, which is exactly why the same physical bag can be a personal item on one carrier and require carry-on treatment on another.

Across every airline covered in this fit checker's data, from American and Delta down to ultra-low-cost carriers like Ryanair, the small under-seat item is included free on every fare, with no exception found. Ryanair, which charges for nearly everything else, still includes one free personal item, up to 40 x 30 x 20 cm, on every single fare it sells.

That consistency makes the personal item the one part of your baggage allowance you can generally count on being free, regardless of which airline or fare you've booked.

It's worth noting this consistency holds even though these same airlines disagree sharply on carry-on policy. Ryanair, easyJet, and most ultra-low-cost carriers treat the personal item as their one guaranteed free allowance specifically because it's small enough not to meaningfully compete with paid carry-on and checked bag revenue, the business model depends on that item staying free and small.

It also holds true even on airlines that don't bother publishing exact personal item dimensions at all. Delta, Alaska, and Southwest each skip a numeric size limit for the personal item, but none of them charge for it either, the free part of the policy is consistent even where the measurement isn't. That's a genuinely useful shortcut when you're comparing airlines quickly, the free-or-not question rarely changes even when the exact size question doesn't have a published answer.

Some airlines include the full carry-on free on every fare, no exceptions: American, Delta, JetBlue since September 2024, and British Airways even on its cheapest Economy Basic fare. Others restrict it on their lowest fare specifically: United's domestic Basic Economy drops down to personal item only on most routes, with exceptions for South America, transatlantic, and transpacific flights.

A third group never includes a full overhead-bin carry-on for free, on any fare. Ryanair is the clearest example: every fare includes the free personal item, but the larger 10 kg overhead bag is exclusively a paid add-on, sold as part of a Priority and 2 Cabin Bags option, never bundled free.

Airlines that restrict the carry-on rather than eliminating it outright, like United's domestic Basic Economy, usually do it as a fare-tier restriction rather than a blanket airline policy, meaning the same United flight can have Basic Economy passengers with personal-item-only and Economy passengers with a full carry-on seated next to each other.

The safest assumption is no assumption. Whether your carry-on is free depends on the specific airline and, often, the specific fare within that airline, and treating one carrier's policy as the industry standard is exactly what leads to a surprise fee or a gate-check.

Check your airline's dedicated size page before booking, or, faster, run your bag through the fit checker, which tells you directly whether a given bag clears as a personal item, a carry-on, or neither, for the specific airline you're flying.

It's worth checking this before you book, not just before you pack, since on a fare that turns out to be personal-item-only, knowing in advance lets you either choose a different fare, pack lighter, or budget for the carry-on add-on ahead of time rather than discovering the restriction at the gate.

American: personal item up to 18 x 14 x 8 in, free on every fare; carry-on up to 22 x 14 x 9 in, also free on every fare including Basic Economy. United: personal item up to 9 x 10 x 17 in, free on every fare; carry-on up to 22 x 14 x 9 in, but excluded on most domestic Basic Economy tickets.

Ryanair: personal item up to 40 x 30 x 20 cm, free on every fare; carry-on (its 10 kg overhead bag) up to 55 x 40 x 20 cm, never included free, only purchasable as an add-on. Three airlines, three different relationships between the two bag types, all under the same personal item versus carry-on framework.

The takeaway across all three examples is the same: neither bag type is fixed by the industry, both are fixed by the specific airline and fare you've booked, and the only way to know for certain is to check that specific combination rather than extrapolate from a different airline's rule.