Bad Boy Blue Aqua Punching Bag 18 Inch or 21 Inch Heavy Punching Bag Ships Unfilled - Includes Shackle, Garden Hose Filling Nozzle and Stoppers For Experienced & Novice Fighters - Improves Punching Power, Agility, Flexibily and Accuracy While Easier on Joints Tested by MMA Experts, Boxing Professionals and Novice Boxers Around the World Multipurpose - Designed for Indoor and Outdoor Use for Commercial Gyms or Home Gyms Durable and Long Lasting - No Hard Spots or Settling - Backed by a 2-Year Warranty