Most airlines maintain carry-on item measuring racks in front of the check-in counter and/or gate service counter. Technically, if your bag (or other type of carry-on item) won't fit completely into that rack, it is oversized and must be checked.
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While some airlines specify size limitations for personal items, others simply require the item to be small enough to fit underneath the seat in front of you. For personal items, here's the standard size on major airlines in the United States: American Airlines – 18” x 14” x 8”
Measure the total linear inches of your bag.Because bags can be so many different shapes and sizes, some airlines just give a linear inch or centimeter measurement your bag needs to be under. Measure the length, height, and depth of your bag, including handles and wheels. Add those three measurements together.
Usually, many airlines won't check every carry-on but will instead go for ones that look oversized. If your luggage does not fit in the sizer, you might have to pay a checked bag fee along with the gate checking fee and have your bag transferred to the airplane's cargo.
I.Most airlines measure check-in luggage in linear dimensions, which means the sum of the length, width and height. The most common linear limit for check-in luggage is 62 inches, though it's prudent to confirm.
Most Airlines Don't Care if Your Carry-On Is 1 Inch Too Big. Carry-ons are measured at the airport before boarding the plane. It's done with metal measuring boxes just in the right size for the allowed carry-on dimensions. If your bag is too large and it isn't flexible, you won't be able to fit it inside.
If your carry-on is 1-2 inches over the size limit, don't stress about it too much. Most likely, you'll be allowed to pass through without anyone saying anything. But be prepared that if you encounter a strict airline employee, you might have to check it in.
However, every airline has different restrictions for size. In most cases, your backpack should be no more than 18 x 14 x 8 inches. You should confirm with the airline to avoid penalty fees if your personal item is too large.
Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.
A personal item is any type of luggage that fits underneath the plane seat in front of you. Most domestic airlines in the United States require a personal item to be 18” x 14” x 8” or smaller in size. Personal items can include a purse, briefcase, small backpack, laptop bag, weekender or small duffel bag.
In general, travelers are permitted to bring into the plane one personal item and one carry-on bag with them on most flights. The personal item is often a small bag, such as a handbag or laptop bag, that is able to be stowed away beneath the seat that is directly in front of you.
Personal itemsThese items must fit under the seat in front of you, so they must be 9 in x 10 in x 17 in (22 cm x 25 cm x 43 cm). Common things include purses, backpacks and laptop bags. If you're at the airport and not sure if your bag is the right size, you can use our bag sizers to measure your bag.
Most airlines allow passengers to bring on both a carry-on and a personal item like a backpack, laptop bag, purse, briefcase, shopping bag, etc. The general rule of thumb is that your personal item is smaller in dimension than your carry-on bag and it can fit underneath the seat in front of you.
In general, standard domestic carry-on luggage size is 22 x 14 x 9 inches. If you're flying internationally, that may vary a little to 21.5 x 15.5 x 9 inches. Remember, those dimensions include the handle, wheels and anything else that may protrude from your suitcase so don't miss them from your measurements.
Unless your carry-on is extremely large, the airline employees at the gate most likely won't ask to measure it. If they'd ask each passenger to measure their carry-on, the boarding would take too long. This could cause delayed flights, which airlines don't want.
Your baggage will be considered oversized or overweight when it exceeds the permitted dimensions and weight for checked baggage (50 lb in Economy class, 70 lb in Business class, and 158 linear cm).
Personal items can include small backpacks, purses, briefcases, handbags, tote bags, camera bags, diaper bags, and laptop bags — as long as the personal item can fit underneath the seat in front of you. Delta underseat dimensions are 20 inches X 15 inches X 11 inches (55 cm X 38 cm X 28 cm) on most aircraft.
Are cabin bags weighed? They can be, but more often they are size-checked. We recommend that you ensure your bag is within the weight and size limits the airline specifies if you want it on board with you. If the staff deem your bag too big or too heavy, it will be checked.