They're useless. The thing needs to be open so it ...
I've had mine for two years and it still works. I smoke every day, sometimes a few times a day. I only use one-hitters though, so not a lot of smoke is going through these. I threw away the caps when I got it. They're useless. The thing needs to be open so it can air out. Your breath has a lot of moisture. I have two regular smoke buddies, and one junior. I love them all. However, I accidentally put my junior one in the washer (yes, the smoke buddy was unusable after this) and it made a mess in my washer, but that's my fault. I love these. They are a bit harder to blow through now that mine is so old, but I just can't afford another one. Thankfully, mine still works.
Rating: 5 stars