I take a lot of the vitamin boost Airborne Effervescent, they come in these 2 inch long plastic cylinders with a good air tight cap. most health food stores carry it.
after a while I ended up with a bunch of these containers.
I'm thinking of ways to re-use them:
water tight container for matches
or use them for vitamins, imagine that!
or for the petroleum jelly cotton balls fire starters
I was thinking since the 35 mm film containers probably have chemical poisonous residue, these Airborne containers are made for stuff safe to ingest...
you can use it to collect rainwater from the tent, about the capacity of a 3 tablespoons.
they are air tight, water proof, can float?
if you have any suggestions for multiple uses, let me know.