KA-BAR Knives Backpack Kaster, Lightweight Fishing System, Black 9921 The KA-BAR(R) Backpack Kaster" an American-made" lightweight fishing system designed to tag along on all your outdoor adventures is made from Ultramid(R) and weighs 0.25 lb. It is comprised of three main components. The handle is inspired by the iconic KA-BAR USMC Fighting/Utility Knife and has a hollow storage compartment for extra line and lures. The head of the Kaster is where your fishing line attaches" and a plastic clamp-like device is included to secure your line in place when not in use.