How do you measure personal carry-on luggage?

1. H x W x D: Most airlines use this formula to calculate bag size. For example, they might require dimensions like 22 x 14 x 9 inches, which is the most common set of dimensions for carry-ons.



Measuring a personal carry-on item (which must fit under the seat in front of you) requires measuring the length, width, and height, including all protruding parts like handles, wheels, and side pockets. For most major airlines in 2026, the standard limit is approximately 18 x 14 x 8 inches (45 x 35 x 20 cm). To measure accurately, place the bag against a wall and use a tape measure for the height from the floor to the highest point of the handle. For width and depth, measure the widest points of the bag when it is fully packed. If your bag is a soft-sided duffel or backpack, ensure you don't "over-stuff" it, as it must be able to slide into the metal sizer at the airport gate. If even one dimension exceeds the limit by an inch, gate agents may require you to check the bag, often incurring a high "last-minute" fee.

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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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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.

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With luggage fit you can measure your travel bags with your camera. The app uses AR to measure the size of your bag and compare it with the maximum size allowed by your airline to see if it fits.

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While these sizes vary by airline, a personal item will typically measure no more than 18 x 14 x 8 inches or 45 x 35 x 29 cm. If your bag does not fit within these dimensions, the airline will likely consider it your 'carry-on' bag and charge you accordingly.

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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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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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A backpack can be your carry on if it meets your airline's carry on size limits. A personal item is a smaller, secondary bag, which you'll stow under the seat in front of you. Read Carry Ons vs. Personal Items for more on the differences between the two.

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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. In most cases, backpacks are considered personal items as long as they fit under the seat in front of you.

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Most airlines let you bring a carry-on bag and a personal item. In most cases, your handbag, briefcase, or small backpack must fit beneath the seat in front of you and within the airline's size restrictions. In contrast, a carry-on bag is typically larger and is stored in the overhead compartment.

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Small personal item The airline states it cannot be larger than 40 x 20 x 25 centimeters (15.7 x 7.9 x 9.8 inches), but there is no weight limit. It should be stored under the seat in front of you.

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Ryanair Carry-on Allowance
Size Restrictions: Personal: 15.7 x 9.8 x 7.9 inches (40 x 25 x 20 cm) Standard: 21.7 x 15.7 x 7.9 inches (55 x 40 x 20 cm) and 22 pounds (10 kg)

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American Airlines
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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Usually, the weight is for your larger piece of luggage, such as your rollerboard. The personal item is not usually weighed, but yes, airlines can weigh your carry-on. Impossible to provide more accurate information, as you don't name your airline. It all depends on the airlines you're flying.

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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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It's easy to determine the size of a 20kg bag in Ryanair, since they have a very specific policy. Ryanair's maximum checked bag size is 55 x 40 x 20 cm including handles and wheels. It also has a maximum weight of 20kg. So as long as your bag adheres to these measurements, it should be accepted as a 20kg bag.

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Hand baggage must have a maximum length of 55cm, width of 40cm and depth of 23cm. These dimensions include wheels, handles, side pockets, etc. If hand baggage exceeds this size, passengers will be asked to return to check-in and check the bag into the hold.

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A rock or a horizontally placed water bottle can work well. You'll also need some household items to use as a counterweight. You need to choose items that add up to the maximum baggage weight limit. If the limit is 50 pounds, try to find 50 pounds worth of household items.

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