All of our free standing bags are made by CENTURY; well-known for their innovation in creating durable and adjustable free standing bags. All are adjustable to 4 positions in height from 52" to 70" except for the Powerline XXL which is non-adjustable. All are available in Blue, Black or Red colour except for BOB and BOB XL which are Tan and have a plastisol body. The base can be filled with sand or 20 gallons of water.