Title: Wish I could give this ZERO stars!!!
Product review: I bought these cups because I thought the idea of no valve was excellent....however, I quickly learned that while it may be a good idea, it was very poorly executed in these cups. I have purchased (and returned) 2 packs of 2 because all 4 leaked. I thought maybe the first set was just a fluke...Nope. These cups are NOT spill proof. They aren't even drip proof! The return air valve leaks profusely on all of the ones I tested. I do NOT recommend these to anyone!!
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