This all new training bag features a next-generation design with an elongated striking surface and air-chambered technology. It offers the most joint-friendly striking on the market today. The sturdy base weighs 40 kg when filled, making it difficult to knock over, so you can get a great cardio workout in a freestanding design; eliminating the need for cumbersome hanging bags and hardware. Not to mention, it gives you the mobility to train wherever you want! Comes complete with a double inner air bladder wrapped in a thick polyester denier exterior.