What size suitcase is better for traveling abroad?

The size of a 22-inch suitcase is: 36cm*52cm*26cm. When it stands up, it will reach an adult's knee.

Luggage size selection:

①20-inch suitcase: it is recommended that one person use 1-5 days for business trip or short trip. The capacity is about 43 liters, the detailed size is 50*36*28CM, and it can hold about 30-35 shirts.

②24-inch suitcase: It is recommended that two people travel in China for 7- 10 days. The capacity is about 60 liters, the detailed size is 60*45*30CM, and it can hold about 50-60 shirts.

③26-inch suitcase: It is recommended that two people travel in China for 7- 10 days. The capacity is about 85 liters, the detailed size is 66*46*30CM, and it can hold about 70-80 shirts.

④28-inch suitcase: It is recommended that two or more people travel abroad without shopping, and one person study abroad for more than 10- 15 days. The capacity is about 102 liter, and the detailed size is 70*50*35CM, which can accommodate about 100- 120 shirts.