Improvements relating to the stoppering of containers

A container for a fluid, the container comprising a container body defining an interior for storage of the fluid and a valve member to close in a storage condition an outlet of the container body;

• the valve member comprising a central body and a flexible skirt;
• the flexible skirt comprising an annular wall having a free edge directed towards the outlet of the container body, wherein the annular wall defines an annular sealing portion that extends circumferentially around the valve member to provide in the storage condition an unbroken annular seal with the container body;
• wherein upon an increase in the pressure of the interior of the container the flexible skirt is configured to deflect inwardly towards the central body to break the annular seal so as to accommodate outflow of fluid through the outlet.