There are countless reasons to carry a keychain multitool. You'll probably use this one to open bottles.
There's something rather enticing about a piece of titanium nitride-coated metal that costs less than $10 and is ready for use at a moment's notice. With 7 different functions, from a pry bar to a flathead driver, Gerber's Shard is the epitome of "you don't need it until you need it." Have I tightened the occasional loose screw to stop the door from creaking? Yes. Have I cut into plastic packaging that would otherwise cause me to throw a tantrum? You bet. But I truly find no greater satisfaction from owning this keychain tool than the moment someone asks if anyone has a bottle opener. I'm there to save the day, time and time again. And you're always welcome.