This is the beast, the largest bag we offer, the 21” Aqua Punching Bag is no joke. This Aqua Heavy Bag gives you the most space to work. So go ahead, throw or kick it however you like. This beast allows you to deliver knee or leg kicks with serious power, all without worrying about joint pain or durability and go ahead,.. uppercut this bag for days! For serious fighters, commercial gyms and group boxing classes, the 21” Aqua Training Bag is the very best option.