18"x18"x16" moving boxes (3.0 cu.ft.) Bundle of 20.

This is your do it all box size. Large size box which can hold just about any household items. Small appliences, toasters, can openers, cloths, etc. Easy to carry boxes for general uses. This is a very versatile box size and probably the one you want if you are only buying one size.

18"x18"x22" moving boxes (4.125 cu.ft.) (bundle of 20 boxes)

This is your X-large moving boxes size. Good for games, blankets, lamps, cloths, toys and all large items.