A pool cleaner debris bag (18) having an access opening (24) and a closure means (25) operable to close the access opening (24) for collecting debris or open the access opening (24) for emptying debris from the bag (18). The closure means (25) includes a clamp member (50) having clamping edges (56) for squeezing together bag layers (28, 29) to close the access opening (24). The closure means (25) is buoyant in water for orienting the bag to avoid impeding cleaner body (6) travel.