I have experienced pros and cons with these sippy cups. While I like how they insulate the bevarage and keep it cold longer than regular sippy cups and that you don't need to insert or keep track of any type of valve, they do seem to tend to leak if they are, for instance, left laying on their side on the table, couch, wherever. Once you know that, you can tell your kids not to leave them tipped over, but if your kids are like mine, that is hit or miss...
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