What is the maximum size to fit under a plane seat?

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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I am 6'3 and pushing 400 pounds and I have never had a problem on BA flights. Yes I need a seatbelt extension but only so I will be comfortable. I admittedly do fit between the armrests. I do feel bad for people next to me because my shoulders are quite broad but I try to get an aisle seat so I can at least lean out.

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? Flight Approved Carry on Backpack: Size of travel backpack: 20.47 x 12.99 x 8.66 . Capacity: 35L. This luggage backpack is meet the allowed maximum size of most IATA flights and also fits in the overhead compartment and the underseat in flight.

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A Spacious Underseat Bag
Luckily, Tortuga makes backpacks that work as underseat carry ons. 30L or 40L backpacks are great options for primary carry ons but are usually too big to be considered personal item that need to be small enough to slide easily under the seat in front of you.

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If the dimensions of your backpack do not exceed 18 x 14 x 8 inches (45 x 35 x 20 cm), then it would fit underneath the seat.

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Is a 50L backpack too big for a carry-on? Yes. The usual maximum dimensions for carry-on luggage are 9 inches x 14 inches x 22 inches (22 centimeters x 35 centimeters x 56 centimeters). This is 43.12L, so your 50L backpack is about 16% too big.

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All our fares include one small personal bag which can be brought on board, such as a handbag or laptop bag (40x20x25cm), which must fit under the seat in front of you.

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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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Peak Design – Travel Pack 30L Offering 30 liters of space, it is perfectly sized to comply with Ryanair's carry-on restrictions, yet spacious enough to carry all you need for a short trip.

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The 40L will max out carry on dimensions on most airlines so you never have to check a bag. For stricter airlines, like RyanAir, 30L will be a better choice.

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You will be fine. at size 24 your bottom will fit in the seat BUT you may need a seatbelt extender (ask stewards as they pass) and you may find the table in front doesn't come down full.

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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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While personal item size restrictions vary across airlines, most airlines consider a small backpack, purse, briefcase, or laptop bag to be a personal item. These must always fit under the seat in front of you. Many airlines restrict passengers to one personal item and one carry on bag.

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Southwest Airlines' website recommends a personal item that's no larger than 18.5 inches x 8.5 inches x 13.5 inches. Spirit Airlines allows a personal item for all travelers that must not exceed 18 inches x 14 inches x 8 inches, including handles and wheels.

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If you are asked to fit it into the measuring stand and you can't squeeze it in, you will have to pay to check it in. What Ryanair is very strict on is not taking a full-size cabin bag on board unless you have paid for the right to do so.

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Is toothpaste considered a liquid by the TSA? Yes, toothpaste must adhere to the 3-1-1 rule for liquids and gels. Toothpaste can be brought through TSA security in your carry-on as long as it is 3.4 ounces (100 milliliters) or less and placed in a 1-quart bag.

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How we choose the underseat cabin bags
  • Best all rounder: Cabin Max Travel Bag.
  • Best for maximum packing space: Decathlon 20L Bag Essential.
  • Best for quality: Antler Chelsea Overnight Bag.
  • Best under seat suitcase: Flight Knight Lightweight 4 Wheel Suitcase.
  • Best under seat backpack: Lossga Backpack with USB Charging Port.


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Most airlines allow backpacks as carry-ons, but size and weight restrictions vary depending on the carrier. Typically, the bag must be within the cabin baggage dimensions of around 22 x 14 x 9 inches (56 x 36 x 22 cm), commonly considered the standard size for carry-on.

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