“A marvel of injection molding capabilities. It fits securely without having to be crushed onto the cup. It still comes off easily but doesn’t just fall off either. The straw hole is surprisingly water tight when closed yet still compatible with the typical large diameter silicone straws. Best of all the “button” for the lack of a better term seals the opening to make the cup functionally leak proof. I’m not sure I’d trust it enough to leave a cup upside down in a pack all day, but it at least protects against spills.
Well done all around.”
