I store mine in DVD cases.
I put colored paper in the front of the case (they are color coded by nesties, shapeabilities, other brand dies, etc) and then cut the cardboard part with the pic to fit (usually 7 inches),,,,,and place that over the paper under the clear plastic sheet. That way I can tell instantly whether I have all the dies in the set when I clean up,,,,,or if I'm missing one.
I also label the spine, so they can stand up on a shelf and I can find what I want pretty quickly.
spellbinder storage By CommaHolly