Formula 420 Universal Caps for Cleaning, Storage, and Odor Proofing

I use this product daily with the Formula 420 Glass cleaner. My glass gets quite nasty and dirty glass is ridiculous because it only takes a few minutes to clean it. The product fits nicely over my smaller glass but if the outside is wet it may come off in the shaking.

Me holding my hand over it does better and also it broke on me on a smaller piece

Holds on decently. It can come off but just don’t go crazy with it. Otherwise it fits great. Kind of a condom feel

They were perfect for my bong

However they get a little slippery when they get wet, and you have to hold them in place. Other than that, they do their job.

Doesn’t have a good suction so you won’t be able to shake your stuff to clean it

This is the greatest invention of all time!

The silicone/rubbber broke on its very first use. It felt cheap and non durable but i gave it a go and both of the rubbers melted off in the middle of shaking so it made a bit of a mess as well >:(Absolutely dont waste your time or money. Basically a one time use and throw away.

I bought these so I could put them on the openings and soak my “vase” with dish soap and warm water and be able to have soak every part of it. They do what they’re supposed to do, they block water from coming out. However, if there’s a lot of pressure the cap will fall off, especially when the cap has water on it. The trick may be just to make sure the cap and place it’s going onto are both dry. Overall it’s not too bad and I still use them on occasion.

I use 99% iso to clean my glass and these caps stood up to it and didn’t ‘disintegrate’ during cleaning. Unfortunately they didn’t last very long, maybe a month or so before they started getting micro tears, likely from my nails but possibly from wear. I really like them for storage, as it keeps the smells inside. I may give them another try and treat them more carefully next time to see if they last longer.

Easy to use, flexible enough for various sizes. But they LEAK! They aren't strong enough to fully seal.

If liquid gets under them they will slip off. Other then that easy to use, great product.

Second time using (with the formula 420 glass cleaner to boot) and the silicone has already torn - a bit of the crystals from the cleaner got underneath while shaking and I moved my hand.It’s good enough for price though, just be careful not to get any crystals between the silicone and glass while shaking.