A boot knife is a small fixe-blade knife that is typically carried in one's boot. They are also commonly carried on one's belt, or under ones' pants leg. They are even worn around the neck by means of a beaded chain or paracord. A knife worn around the neck is referred to as a neck knife. They usually come with sheaths, which can have clips on them. Boot knives are typically double-edged, with small blades generally ranging from 3-5 inches in length.