These popular aluminium pill containers happen to be the perfect size for storing ground herb for vaporizer glass stems used by Arizer Air / Air2 / solo / solo 2 etc., especially for quick refills on the go (hiking, camping etc).

I made a small hydration cap to snugly fit into the top of the container in case you need to store them for a while, or if what you have is already too dry for your liking. Just put in a small piece of orange/lemon/lime peel or a bit of clean sponge or cotton dampened slightly.

These containers can be found on amazon and are crazy cheap:
https://www.amazon.ca/Portable-Bantoye-Waterproof-Container-Traveling/dp/B07GSSQV15/ref=sr_1_2?keywords=aluminum+pill+containers&qid=1553870568&s=hpc&sr=1-2