I was reading a clay book some time ago and the writer had suggested storing clay veneer sheets in plastic page protectors. I wasn't really sure how well that would work but I was keeping them stored in containers and wasn't really happy with that system. I would forget what was in the box and had to pull everything out to find what I was looking for and some of the sheets would start to dry out and crack.
I had several types of sheet protectors and decided to test them out to see if they would react with the clay. I would check them every day and after several weeks there was no reaction with the plastic whatsoever. so I proceeded to fill them with my clay veneer sheets and pieces I had stored.
I liked the clearer type protectors as I could see through them much better and went with those. I cut down the one side leaving the bottom seam still attached. I could then fill the sheet up with all my clay pieces easily and then "reseal" it again.
It is really cool how the clay sheets stick to the plastic sheet keeping it sealed and you can turn the pages in the binder without them falling out or moving. It also keeps them nice and clean and dust-free.
This is such a handy way to keep them and I store them in the same binder as my Clay Color System Recipes, etc. so everything is all together.