I like to use the plastic "clam shell" containers that fruits and veggies come in at Sam's Club. The cherry tomato boxes work great for 5" squares, strawberry boxes work great for rolls for 2 1/2" strips, cherry boxes are nice for storing little projects in the making that use fat quarters. Because they are designed for fruits and veggies, they have air holes, so the fabric can also "breathe" in storage. They cost nothing, easily replaced if they crack, and they stack nicely.