Posture-responsive therapy is delivered by the medical system based on posture state input from only one of multiple posture sensors at any given time. A magnetic coupling, which is comprised of an inner rotor and an outer rotor, is arranged between the roller and the drive. A position holding mechanism holds the display body at an optional position anywhere between the vertical position and the inclined position. The refill container includes a container base wall and opposed first and second container side walls extending up from the container base wall.