If you're at all like me you have a lot of dice because you play a lot of games other than D&D. Which makes the one die per compartment dice box something of a non-starter. Likewise the slot styles for 7-die sets. So I designed my own. The first three designs just confirmed what I already knew: dividers can be useful but tiny compartments are a waste. The fourth design, this one, is what I've been using for about 6 months at this point and it's the one I'm most happy with.

The tray (base) has three compartments large enough to hold 12-16 dice of various types (my photograph includes a batch of polys with extras for most, two sets of FATE dice, and 15d6 for Champions). The lid functions as a dice rolling tray. The three cutouts are templates for cutting felt or foam to line the tray and lid.