The ArtBin Super Satchels are what I use for holding up to 12 inch blocks. I actually prefer them to the Iris brand, since they have a nice handle and better latches. I usually buy them at JoAnns when they have the 1/2 off storage sale. They also stack better than the Iris brand.
They have 3 depths: a really shallow one (Slim), the regular one (3 1/2"), and the "Double Deep" (6 1/2"). I use the regular one and the "Double Deep," especially love Double Deep for holding a whole project (blocks, backing, and pattern).
Last edited by caspharm; 03-09-2012 at 11:50 AM.
Reason: added more info