Lined them with freezer paper on the bottom, and labeled one for each class
on the non- printed side of the box. These are good to store any 9x12 or
12x18 work in progress. The 12x18 will fit (but not exact ) the standard
size pizza box. They stack and take up less room (about 2/3rd) than the
regular boxes I had that stored 2 classes each. Then for the yearly art
exhibit, I was able to store the 9x12 mounted work with 12x16 inch mats. Now I
use them for lots of things, like visuals that are not poster size etc.... can
have one for each artist too!