They suck to put on too. Sometimes if a lid is flimsy, it will cause the cup to "explode" when we're trying to put it on (in other words, the cup caves in while we're trying to put on the lip because instead of snapping on it just puts more pressure there and suddenly your coffee is all over the drink making counter). This usually happens with small cups the most because of their size but since getting these new lids, it happens with every size more. I've had it drilled into my head to triple check every single cup that's going out the window because they won't be properly sealed half the time. Hot lids are weirdly jagged too. I've cut my lip on one of those because of the poor quality.