Carbonated beverage container and method of manufacture therefore

A sealed, openable liquid container which is pressurised to a pressure greater than atmospheric pressure and which is partly filled with liquid (24) so as to define a primary headspace (26), and a hollow body (18) in the container (10), said hollow body (18) having at least one upper restricted orifice (20) and at least one lower restricted orifice (22), said upper and lower restricted orifices (20 and 22) providing communication between the interior of the hollow body (18) and the interior of the container (10), the interior of the hollow body (18) being partly filled with liquid so that (a) said at least one upper restricted orifice (20) opens into a secondary headspace (23) defined within the hollow body (18) above the liquid therein and (b) said at least one lower restricted orifice (22) is submerged in the liquid, and said at least one upper restricted orifice (20) being of a size such that, despite being in communication with the liquid in the container, it is effectively sealed against release of gas from the secondary headspace (23) into the liquid (24) in the container (10) until the latter is opened.