How can I store my oil pastels?
So the main considerations for storing oil pastels are:


The individual pastels are kept separate, so that they do not bleed into one another
They are kept reasonably cool (room temperature, ~20ºC is fine)


If the latter is a problem, just keep them in the fridge (although you'll want to allow them to warm up a bit before using them).

As for the former, if you've lost the original packaging, that is a bit of a pain. Artbin make art supplies storage boxes of many varieties, there will probably be at least one type of box that fits your needs. There are also plenty of places that sell slightly more expensive wooden pastel boxes - these might be overkill though.

In a pinch, the tray from a box of chocolate fingers might do too.