A storage device (10) comprising a receptacle (12) and a movable closure member (22), the closure member comprising a seal (30) about its periphery, for positioning against the inside of the receptacle, and a valve (32) within its periphery, wherein the closure member can be moved within the receptacle such that its periphery is substantially continually in contact with the internal surface of the receptacle, and wherein, when in an open position, the valve allows flow of fluid from within the receptacle through the valve, and when in a closed position, the valve prevents flow of liquid from within the receptacle, wherein the receptacle is substantially closed at its lower end.