Leaks from mouthpiece

Durable, easy to clean and easy for my little ones to drink from, but it is definitely not leak proof. I only allow water in these cups, but regardless of what beverage is in them, there seems to be some kind of pressure buildup inside the cup and water leaks from the mouthpiece constantly. To get it to stop spewing water, I have to unscrew the lid and then squeeze the mouthpiece, then the water will flow back down the straw and into the cup. But it has to be done frequently because water constantly leaks and drips from the mouthpiece. We’ll continue to use the cups we have for now, but I will not be buying more!

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