I generally keep them in the original packages. But sometimes up to a half a tray will get left in the covered plastic flipper tray on the reloading table, or in the primer feed tube on the press (with a blast shield around it)
The 2 main things to remember are:
- keep penetrating oil FAR away from them (not dangerous but it will ruin them), and
- do not pour them all into a glass fruit jar to save space.