I appreciate the comments as well as the personal emails with advice for storing unmounteds. Here's what I've come up with and I think it's going to work for me. These containers are Walmart's Mainstays brand made for storing leftovers. They're a 3.25 cup capacity each and you get 12 for under $4.00. Each container holds anywhere from 1 cut sheet of rubber to 3 sheets depending on how big the sheets are. I took the index that came with the stamps and shrunk it waaay down so it would fit onto the lid. Each container is labeled on the front as well. Now they're cut, labeled, indexed and out on a table so I'll use them more. I'm still cutting sheets apart that I've had for a long time but just never got around to cutting them ...kind of ashamed to admit that but I bet some of you have done the same thing. It feels good to get this done!