Title: Leaks like a sieve.
Review: Worked great for about two weeks. Then started leaking between the lid and the base. No matter how tight the lid is screwed on, the o-ring inside might as well not exist. I am incredibly disappointed and would not recommend this cup to anyone. Save yourself the hassles caused by your spontaneously leaking beverage(it'll be leak-proof until it isn't anymore) and buy something else.
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