Artbin Magnetic Sheets

I started out with one artbin magnetic case and 9 sheets. I have now expanded to 5 cases and 15+sheets per case. I leave my Little B dies in their own magnetic wrap they come in. So far this has worked well for me. I've seen other folks various storage mechanisms, none of them seems to be easily transportable and "safe". I want to make sure my little dies won't fall out and scatter to the four winds.