I keep mine in 4 oz jelly jars or baby food jars that seal completely (some have a bad seal after cleaning) depending on how much headroom there is in the jar. I keep it all inside a sugar cookie tin inside of a safe in a cool dark area of my house that doesn't see many swings in temperature.
I like those jars Stu. Did you stain them black/gray?
I replaced the metal lids with plastic one-piece lids from Walmart. These will be my "bulk" storage containers. After grinding it goes in the Jyarz Classic. The black, purple, white, and red ones are actual Plastidip colors. The blue one was first sprayed with three coats of gray Plastidip, then overcoated with regular blue spray paint. So if you do that, you can probably use about any color you want. Plastidip has a limited palette. I like the flat look better though, it's more like the Jyarz. Didn't notice that I was getting "gloss" blue when I bought it