How many inches should I buy for an overseas travel carrier?

I'm traveling abroad to Okinawa for the first time, and I think I need to buy a carrier, but I don't know how many inches I usually use. According to the baggage regulations, I have to set it below 20kg. How many inches do I need to use to make it about 20kg?

Please recommend something that can be used for a long time

772 2018-11-26 Lady

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