There is truth in that good things come in small packages, these metal canisters are just cute stylish and collectable. They also have some real world use value for medicinal purposes. Otherwise they are very collectible and function with a proper seal with a beautiful finish.
You can use this tiny canister for many things beyond medicine storage. You could keep some small keepsakes very safe and in good condition you could also turn it into a pendant it has a military tactical style look.