The Leatherman Skeletool CX ($53) is a definite must-have tool. It features a Stainless Steel and Carbon-fiber handle with Tungsten DLC scratch-resistant coating that holds an outside-accessible sharp serrated blade,  full size pliers with wire cutters, carabiner clip and bottle opener and an interchangeable screwdriver. Even at a mere five ounces, this tool doesn't sacrifice quality and functionality.