Step into range and step up your game. The TITLE Boxing Inside Work Bag Anchor is designed so that you can get closer to the bag and work on the inside more effectively to practice more compact punches. Adjust the closure on the TITLE Boxing Inside Work Bag Anchor to change the height with the reinforced nylon straps that are made to withstand your power.Fills with sand or gravel to weight down heavy bags and training bags to the floor, allowing athletes to get closer to the bag -- inside training -- without affecting footwork.  Ships unfilled.