Great minds do think alike. I covered a series of the largest size with contact paper, then put felt or unused batting on the inside. Used this to carry my project in the camper and used the inside as my design boards. This week I used the same technique on some smaller boxes from Omaha Steaks that I plan to use for small items, feet, etc. that belong to individual sewing machines. I have 20, mostly vintag,e and want to keep what belongs where it belongs, so the machine and the box/es will be put in its own case w/rollers.