Abstract: The device includes two inflatable pontoon members (10, 12) and a frame assembly (24) which extends between and is secured to the two pontoon members (10, 12). The frame assembly (24) includes a horizontal seat section (25) and a back section (33) which is movable between a horizontal position and a vertical position. Two back straps (70, 72) are provided on the frame assembly to facilitate carrying of the device when the back section (33) is in its horizontal position and to support the back section when the back section (33) is in its vertical position. Two stabilizing straps (92, 94) extend between the pontoon members (10, 12) beneath the frame assembly (24) to provide rigidity for the device.