They are perfect for holding quilting projects. I have four quilt-piecing projects going, from wall hangings to a twin bed quilt,and each of these cases holds the all the supplies (fabric, blocks, strips, etc.) for each project. They stack so I can easily see which project I want to work on, and for the hand piecing quilt, the opened case sits nicely in my lap and I can hand piece without taking the fabric out of the case