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Title: Don't waste your money
Review: This cup doesn't leak. Unfortunately, you can't sip from it either (unless you have the patience to drink your beverage at the rate of 4-5 drops per minute). There is barely any difference between the open and closed positions.Unfortunately I couldn't return it since I mangled the cup by removing a large o-ring, hoping it would allow the contents to flow more freely. It did, but now there is no difference between the open and closed positions. My suggestion is not to waste your money on this product.
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