Choose by size

The size of your suitcase should be determined by the number of days you plan to travel and the amount of luggage you will need. Here are some guidelines:

1-3 nights (20-40L, S size) : For weekend trips or short business trips. Carry-on size (e.g., within 55 x 40 x 25 cm) is convenient.

3-5 nights (40-70L, M size) : For domestic travel or medium-term business trips. Compact and easy to handle even as checked baggage.

5 nights or more (70-100L or more, L size) : For overseas travel, long-term stays, or when carrying lots of souvenirs. This is often reserved for checked baggage, so check the airline's size restrictions (e.g., within 158cm).

If you don't have much luggage, you can choose a smaller size, and if you have a lot of luggage, you can choose one with an expandable feature to accommodate your needs!

Many airlines have set the size of carry-on suitcases as "the sum of the three dimensions must be within 115cm (e.g. 55 x 40 x 25cm , including handles and wheels)."

However, low-cost carriers (LCCs) may have even stricter restrictions (e.g. 50 x 35 x 20 cm).

Before purchasing, check the latest rules on the airline's official website and choose a suitcase that is clearly marked as "carry-on compatible" to be on the safe side.

As long as the unexpanded size meets carry-on standards, there's usually no problem.

However, expanding it often exceeds size restrictions, so be careful not to expand it when carrying it on board. If the size is checked at the airport, the expanded size may be checked in.

Most airlines have a size limit for checked baggage of " the sum of the three dimensions must be within 158 cm (including handles and wheels)" (e.g. 80 x 50 x 28 cm ).

However, there are also weight restrictions (e.g., 23 kg in economy class), so you need to check not only the size but also the weight. Some low-cost carriers and routes may have stricter restrictions. Be sure to check the airline's rules in advance.

Depending on the brand or manufacturer, the S/M/L standards may vary slightly. For example, one brand's S size may be 35L, while another brand's size may be 40L.

When purchasing, check the " liters (L) " and " external dimensions (cm) " to make sure it fits the number of days you'll be traveling and the restrictions of the airline. The size chart and reviews on the product page can also be helpful.

Here are some tips to help you avoid mistakes:

Clarify the purpose : Choose a capacity that suits your purpose, such as business trips, sightseeing, studying abroad, etc.

Check the airline : Check the size and weight restrictions of your frequently used airlines in advance.

Try it out : If possible, try pulling it in person at a store to get a feel for its weight and height.

Consider expansion features : If you can't read the amount of luggage you have, a model that can be expanded by 5 to 10 liters is convenient.

Also, by taking into consideration comments such as "It was smaller than I thought" or "It was surprisingly heavy" in reviews, you can reduce the discrepancy between your image and reality.