The Viking Tactics. Inc. Back Pack sling was designed to give Warriors and Hunters hands free carry options for their weapon system. The VTAC Back Pack sling allows the user to carry the weapon straight up or down the middle of your back for ease during climbing operations or while dragging game as well as if you need to carry a wounded mate. Hands free, comfortable, and secure, the Viking Tactics Back Pack Sling. Mfg: Viking Tactics