Develop total body strength, stability and endurance by training with the SKLZ Super Sandbag Training Weight Bag. This versatile training tool allows you to execute countless training exercises, working your upper and lower body. Develop explosive power on demand! The removable weight bags can be used as soft weights to increase the intensity of any drill or exercise. The weight bags must be filled with a high density material, like sand. Maximum weight of 40 lbs. It features durable outer shells for long lasting use.