I've struggled to find an organized way to keep my misc. sized stamps. I have my larger ones organized by size, i.e. 4x6, 5x7, 12x6, etc., but the misc. ones have been a real pain. I found these plastic "boxes" at my LSS. They are 8.5x11"x1" and snap closed. The clamshells are by Stampendous, and come in Thin, Thick, and Thicker. These are the ones called Thicker - a little heavier material. 4 fit perfectly into my "magazine" storage units, also from my LSS.