Worm proof containers work fine. From my experience, z-mans of different colours can be stored together if you do not mind mild colour intermixing. Other plastics can be in the same container so long as they are not physically touching i.e. dividers. Although I haven't had any melt on me, obviously being a soft and stretchy plastic means that it's melting point is quite low so avoid extreme heat. This is probably true for every other plastic.