These are by far the worst sippy cups I have ever purchased. We bought them since my daughter is in love with Minnie and thought that they would hold up as well as Playtex sippy cups. The first time we filled them, they leaked like crazy. I thought perhaps I put too much in so I decreased the amount and they still leaked. Forget letting them fall on their side, that's even worse. I can't tell you how many leaks we have had to soak up because of these cups. They are in the trash and I am sticking with Playtex. Don't waste your money - they may be cute but you'll need to buy a whole lot of paper towels to clean up the leaks.