These come up on ebay every so often.http://cgi.ebay.com/New-Military-Surviva...1QQcmdZViewItem
One side fits into the other. the side with the folding edges has a sticky glue inside for your items to stick to to prevent loss. I made a copy of these out of a poly 3 ring binder. Lined it with self adhesive velcro. All my items were in small zip lock bags that had a velco dot on them. It was novel. I tried aloksacks but they developed holes after one trip. Now I'm down to plain ziplock bags. Nothing in my kit is fragile enough to need a hard case, and all are water resistant. Some day I'll make a simple pouch out of silnylon.