A sheet feeding device comprising a tray, a sheet feeder, first and second guide members, a separator, and an inclined guide portion. A poppet valve is disposed in the housing between the fluid inlet and outlet and is moveable in an axial direction between a plurality of positions. Thus, the angle of the rigid body is gradually changed with respect to the direction of arrival of the incident wave. The open periphery can be folded inward or outward to create several different configurations of the handbag and the apertures on the side seams and front and back sides are capable of receiving clasps or other fasteners from straps in order to provide handles, carrying straps, and the like for the various configurations.