I'll chime in here. The container is not air tight, so you wouldn't want to store something in it long-term if you are concerned about freshness. But the lid is very secure. You could hold the base, turn it upside down, and shake it as hard as humanly possible and the lid will not come off. It is almost impossible for the lid to come off accidentally. I say "almost" because if I don't, someone will prove me wrong :-)
TECENGThat's rather unfortunate. Most of the items I would keep in a small container like this would be damaged by water, so being water resistant is a must.