Save Brands Silicone Rubber Bottle Cap (6 Pack), Multicolor

Q: If the beer saver is on it and it tips over will it be spill proof.

From my experience they can be. It guess it can depend on the drink in it and how it falls, but I could hold the beer upside down with no spillage.

Q: Do these caps have any writing on it? "Beer Saver"? I want it to be blank.

The caps are only available with the brand "Beer Savers". If you find caps that are blank they are are illegal counterfeit in violation of our Intellectual Property (patent).

Q: Do these work well with Coke bottles?

No they dont fit threaded bottles very well. Get some Kaddy Kaps

Q: Do these keep carbonation in?

Yes- they’re not 100% as fresh as when you first open a drink but they do maintain some carbonation over a day or two. We’ve even had one pop off in the fridge from the build-up of pressure! (Just make sure you secure it tightly the first time to avoid this)