Have you seen the infomercial for Bottletops, if not click on the name and see what I'm talking about. I first saw these at my local convenience store and thought it was a pretty good idea. I finally bought one last week and used it tonight. I really like it.
It will be great for vacations, where we usually drink out of cans while on the road. I don't have to worry about about an occasional fly finding it's way into my can and then drinking it. YUCK! It also nice to not have to worry about knocking over a can and spilling the contents.
Personally, I think they are a little expensive. I paid $3.00 for just one at the convenience store. If you order them via the infomercial, they are slightly cheaper, but then you have to add on the postage. You also get either 10 or 12 when you order them. I think I saw somewhere that you can find them at Target, but not sure of the price.
Either way, I am happy with mine and my mother asked me to pick one up for her this weekend. One thing you must remember when using the Bottletop, you have to make sure you wash the top of the can. A lot of the drink stays on top of the can when you use it.