Great cup. We have only had these a week, but so far no leaks. They have only hit the dishwasher about 4 times each, but they really seem well built. The valve system is sturdy and easy to take out and put back in. It has a couple extra plastic grippy plugs besides the 2 that go to the spout and the other hole in the lid, so maybe these will be less likely to work their way out of the lids while the kids use and drop them. Nice colors, but the design is a little babyish. Wish they came in plain colors!
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