There's a reason the screw cap hasn't dominated the wine stopper industry: Cork still kicks the ass of stamped aluminum for the good stuff-and not just for nostalgia's sake. This is what keeps our evening libations from turning sour. Cork is an unbeatable bottle stopper. It's compressed by machines, jabbed by wine keys, and assaulted by liquids, only to bounce back, close up the gaps, and continue to keep leftover wine at bay.