Awesome cup, DOES NOT [SEP] Well, it has been a bit since I purchased these cups. I have a 1.5 year old grandson who for some reason insists on throwing things. When he does, the liquid from his sippy cup goes everywhere. I read reviews on this cup and I am here to tell you they work. I do not condone my grandson's behavior, BUT I am no longer cleaning up his drinks from the floor. Awesome cup, DOES NOT LEAK