Actually, in general, we don't need to worry about the size of travel luggage, as long as it's enough to hold items. However, if you want to travel by plane, you have to consider the size of your travel luggage because every airline has restrictions on luggage, such as weight, number of items, and size. Actually, the size is not very suitable. Why? Just look below and you'll know.

Common sizes of luggage with pull rods:

18 inch suitcase size: 34cm * 44cm * 20cm

20 inch suitcase size: 34cm * 50cm * 20cm

22 inch suitcase size: 36cm * 52cm * 26cm

24 inch suitcase size: 38cm * 60cm * 28cm

28 inch suitcase size: 48cm * 70cm * 30cm

Due to the size requirements for travel bags, airlines have implemented some regulations. The luggage that can be registered on the side must have a length, width, and height of less than 115cm. Therefore, if you are traveling, you only need to add the length, width, and height, and then check which airline you want to take and whether their check-in requirements meet your expectations. This way, you can choose the airline that suits your needs. Generally, it is recommended to be 20 inches or less.