Title: Leaking problem solved!
Product review: I also had problems with these leaking like CRAZY, but since I wanted something besides plastic sippy cups for my toddler, I was determined to make them work. Solution: Do not overtighten the black adapter nor the black ring. Screw both on just enough, so they are "on," but resist the natural urge to get a tight fit. Something about the pressure makes them leak if you overtighten them. The included instructions also say not to overtighten, but no specifics are listed. I almost returned them, and was relieved to finally get them to not leak. Occasionally they still leak, so I unscrew the parts and put them back on, making sure not to overtighten. Also, if baby turns the bottle upside down long enough, yes, it will leak from the obvious air hole, but not enough for me to use plastic again. These are great; I'm so glad I didn't return them. I also purchased the Sport Caps, since they are interchangeable, which work terrific.
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