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Love this cup for smoothies. My toddler (1 year) loves opening and closing the lid. The design is a bit flawed, as it has a wide open vent hole. So when the lid is open, if you tip it upside down it will leak a steady stream. With smoothies it's not so bad because the liquid is thicker. I dont like these for water. There are better water bottles for that. They do keep the smoothies nice and cold all day, even if I forget to put them in the fridge or if we are out.