I just started buying my DS paints in stick form and these little lab vials are the perfect way to store them so they don’t contaminate each other or get wet accidentally. I just throw the tubes in a plastic bag if I’m going anywhere to paint. No mess, no fuss.
Just started using these. They actually have a really nice case for them, and you can find them for a little over $5.00.
I watched a video whereby someone cut off a small amount, (about half-pan sized, and placed them in their palette, and then kept the rest in the plastic case.