Aluminum pill holder is a crush-proof and waterproof pocket container suitable for critical medicine on your person at all time. It's a aluminum stroge tube,you can easily hold multiple capsules and tablets,like aspirins.When you go on an overnight stay and don't want to bring a spare bottle. The threads works smoothly and don't get stuck,and the O-Ring seal make the smell cannot out .So it is a good smell proof container. The aluminum pill container are small enough to stick on a keychain, and they have a seal so they should be water tight. The quality surprised ,actually.Small,lightweight and well made.