What size carry-on will fit under the seat?

According to airline policy, any personal items stowed beneath seats should not exceed 18 inches by 14 inches by 8 inches.



To ensure a bag fits under the seat in front of you in 2026, you should aim for a "personal item" size of approximately 17 x 10 x 9 inches (43×25×22 cm) or smaller. While specific dimensions vary by airline, most major U.S. carriers like United and Delta use this range as their benchmark. Budget carriers like Spirit or Frontier are stricter, often requiring bags to be no larger than 18 x 14 x 8 inches. These bags are distinct from standard "overhead" carry-ons, which are usually 22 x 14 x 9 inches. When choosing an under-seat bag, it is vital to account for the wheels and handles, as airline staff use rigid "sizers" at the gate. Soft-sided duffels and backpacks are generally better than hard-shell cases for under-seat storage because they can be "squished" to accommodate the life vest container or seat supports that often obstruct the floor space. If you are flying on a small regional jet, the under-seat space may be even tighter, sometimes making even a standard-sized school backpack a difficult fit.

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According to airline policy, any personal items stowed beneath seats should not exceed 18 inches by 14 inches by 8 inches.

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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.

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Your bag will have to fit into the sizer for it to be approved as a carry-on. Having a flexible fabric bag is advantageous in this situation because you'll be able to squeeze it in even if it's slightly oversized. Usually, many airlines won't check every carry-on but will instead go for ones that look oversized.

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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.

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Can I take a 22.5 inch carry-on bag? On domestic flights within the United States, a carry-on bag that's smaller than 22 x 14 x 9 inches (45 linear inches), including handles and wheels will meet the size restrictions of all major airlines, such as United Airlines and Alaska Airlines.

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While this can be confusing, most popular airlines allow you to bring a carry-on and personal item, such as a backpack or purse. In general, your personal item should be smaller than your carry-on and under the specific airline's carry-on dimensions, allowing it to fit under the seat in front of you.

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Can a 24 inch luggage be a carry on? Unfortunately no, the standard carry-on size is typically 22” x 14” x 9”, so a 24 inch bag is too large to bring on board of most economy standard airlines.

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It will fit in the overhead bin, but it is their call whether to let you on with it or whether it is checked as hold luggage. If it is picked up by the gate keepers - it will no longer be carry-on - but you can call it checked hold luggage - and collect it from the baggage carousel at your destination.

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Carry-on bags must weigh less than 35 pounds and must not exceed 10 inches deep, 16 inches wide and 24 inches high. Bags must fit in the overhead bins. Checked bags must be no longer than 62 linear inches (length + width + depth) and must weigh under 40 pounds.

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Including handles and wheels, the maximum dimensions for a carry-on are 22 inches long, 14 inches wide and 9 inches high. Personal items are limited to 17 inches long, 10 inches wide and 9 inches high. United doesn't publish weight limits for carry-ons.

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Famously quipped “the Ryanair size”, 40 x 20 x 25 cm (16 x 8 x 10 in) is the maximum dimensions of a cabin bag (such as a laptop bag or handbag) that ultra-cheap airline Ryanair would allow its passengers to carry into its cabin free of charge under its strict baggage allowance policy.

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Similar to carry-on luggage, underseat luggage is subject to size and shape requirements. However, unlike most of the things people fly with—nearly all of which are precisely designed for airplane use—almost any small bag (your favorite backpack or tote, for instance) can work as a personal item.

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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.

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How strict are the airlines about luggage dimensions? Carryon dimensions are limited to the size of the overhead bin. In those cases dimensions are strict. Anything too big gets gate checked.

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Each passenger may carry liquids, gels and aerosols in travel-size containers that are 3.4 ounces or100 milliliters. Each passenger is limited to one quart-size bag of liquids, gels and aerosols.

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Though you might find an inch or two of a difference with various airlines, the standard domestic carry-on luggage size is 22 x 14 x 9, which includes the handle and the wheels. This size limit ensures your bag — and ideally everyone else's — will be able to be stored safely in the overhead bin for your flight.

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You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.

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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.

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Domestic carry-on policies. A good rule of thumb is that if your carry-on bag fits under the seat in front of you, it's considered a personal item. This includes small backpacks, purses, briefcases, laptop bags, etc. Larger bags, including suitcases, must fit in the overhead bin compartment.

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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.

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