I like the idea and they helped cut back on my daughters gas but I also had issues with them leaking all over the diaper bag. I found if you take them all the way apart before putting them in the dishwasher and them carefully dry all the parts after wash is complete, they are less likely to leak. This is alot of work but since they are the bottles my daughter likes and all that we have left and she wont be using bottles much longer we will keep them.