These storage cases are great on their own, but I like to use a magnetic piece and CD storage. I use magnetic dust covers that I got at Home Depot.
I cut them into squares.
One of my window dies is the Art Impression Window Die. I put the die on the square cut from magnet dust cover. Then I put it in the CD sleeve - that way just in case some thing drops, it still stays together in the sleeve.
Then I put all my different windows on one panel from the Die-Namic Die storage and label it.