Pictured here is a medium-sized sleeve. Sleeves are used for easier transportation of baskets.  The sleeve makes it easy to load the baskets closer together without breaking the plant. This size is ideal for smaller and less full baskets. The size of this sleeve is 13.75 X 26 X 2.75, with a 1.5" LIP. They are sold in packs of 100. You can also get them by the case which holds 10 packs.   

A large sleeve is used to transport big, full baskets. This size sleeve is especially good for large ferns. The size of this sleeve is 23 X 22 X 13.  They are sold in packs of 100.