The unofficial standard is the size of 55x40x20 cm. Suitcases of this size can be taken on board with almost all airlines.
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Known by many as “the EasyJet size”, 45 x 36 x 20 cm (18 x 14 x 8 in) is the maximum dimensions of a cabin bag that EasyJet airline would allow its passengers to carry into its cabin for free.
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.
To calculate the size of your carry-on bag, measure the length, height, and depth (or width) of your bag. You can add the three numbers together to find the total linear inches. For example, a bag with a length of 20 inches, width of 12 inches, and depth of 6 inches would be 20+12+6 = 38 linear inches.
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.
There are three sizes of suitcase: large, medium and cabin. A large case is often suited for a 2 week or longer trip, or a family wishing to pack more and a medium case is better suited for a week away. Cabin size is great for a long weekend or to take on board when you wish to avoid checked baggage fees.
Most airlines follow very similar size regulations when it comes to carry-on luggage. The majority go by a standard height, width and depth measurement. 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.
The most popular size check-in luggage is 25- to 29-inches tall and various widths. Medium-sized check-in luggage measures 25-26” tall and around 18” wide. * One medium-sized suitcase will generally hold what you need for a week-long getaway.
Carry-on bags are limited to 22 inches long, 14 inches wide and 9 inches high including wheels and handles. All three measurements shouldn't add up to more than 45 inches.
If your carry-on is oversized (and doesn't physically fit inside the overhead compartments) or you encounter a strict airline employee, they will ask you to check it in at the gate.
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.
For example, if your bag is 24 inches tall, 20 inches long and 18 inches wide, its total linear length is 62 inches. Note that using modern spinner bags, which include four wheels on the bottom of your suitcase, means you'll have less space within your actual bag.
For a 10-day trip, the suitcase size that you need will be between 18 and 22 inches in length. This size is suitable as carry-on luggage. However, if you want a bigger one for extra space, you can choose a 24-inch suitcase, which is recommended for 2-3 weeks' worth of travel but needs to be checked in.