An apparatus for supporting a patient includes a pad having a first side, a second side, and a fluid chamber configured to receive fluid under pressure. The apparatus also has a pressure source operable to deliver pressurized fluid to the fluid chamber and a pouch coupled to the pad. The pouch has a storage space in which at least a portion of the pressure source is received. The pouch is movable to selectively position the pressure source adjacent to the first side of the pad and adjacent to the second side of the pad.