Abstract: A drinking vessel comprising a container having a mouth and an internal shoulder; a cap for closing the mouth of the container and having an outlet for liquid; and a valve unit removably mountable on the cap and arranged to control flow of liquid to the outlet; the valve unit being so arranged that the shoulder prevents the valve unit from being separated from the cap while the cap is mounted on the container. Also, a drinking vessel comprising a container having an outlet for liquid; and a receptacle removably attachable to an end of the container remote from the outlet of the container; wherein the receptacle comprises parts relatively movable between a substantially closed position and a position providing an orifice for releasing objects from within the receptacle; wherein the receptacle is arranged to be attached to the container in such a position that the container closes off the orifice.

Abstract: A portable collapsible seat with an advanced five-driver integral audio system is disclosed. The seat is designed to be used in conjunction with a video screen to create an enhanced "virtual reality" environment. The placement of the drivers relative to the user's head, combined with the intentionally different bandwidths of sound produced by the different drivers, and the relative acoustical intensities of the drivers produces psychologically "gripping" effect, designed to transport the user away from the reality of the actual surroundings and into the virtual reality of the video presentation. One of the drivers is intentionally oriented and positioned to provide tactilly perceivable vibration through the seat to the user.