Trolley box size trolley to buy much suit

Common daily use trolley case size is roughly 16 inches, 18 inches, 20 inches, 22 inches, 24 inches, 28 inches, 29 inches, 30 inches. Many of my friends can not help but ask according to different purposes, in the end how to buy trolley suitable?

16-inch trolley case

Can take the plane, 16-inch international boarding box size, suitable for one-person travel 2-3 days;

18-inch trolley case

Can take the plane, suitable for one-person travel 3-5 days;

20-inch trolley case

Can take the plane, suitable for one trip 3-7 days, two trips 2-4 days;

22-inch trolley case

Can not take the plane, to be checked, suitable for more than 7 days travel, two travel 3-6 days;

24-inch trolley case

Can not take the plane, need consignment, suitable for two people travel more than 7 days;

28-30 inch trolley case

Do not take the plane, belong to the shipping box, suitable for overseas shopping, or for a long time travel.