While they can be used as a personal defense weapon, knives are a far more useful everyday tool than they are typically made out to be. And if you start carrying one around, we're confident you'll end up using it a surprising amount. Whether you need to clip tags off new clothing or gear, pry or cut open sealed boxes and containers, chop up some food on the go, or even tighten a loose screw, a well-built pocket knife can get the job done.