Drinking vessel

A drinking vessel comprising a generally cylindrical container adapted to contain liquid and a generally cylindrical lid adapted to close the container, in which the lid comprises

• a generally cylindrical outer member, having an annular lip at an edge thereof furthermost from the container, and an end adjacent the container, the lip extending around the entire circumferential edge of the lid;
• a generally cylindrical inner member located within the outer member;
• and
• a generally cylindrical aperture extending between the end of the outer member adjacent the container and the annular lip, and
• a generally cylindrical sealing element located between the outer surface of the inner member and the inner surface of the outer member, said sealing element having an outer surface to provide a firm seal with the inner surface of the outer member but being deformable away from the inner surface of the outer member by suction at the end of the aperture remote from the container so as to cause liquid within the container to flow, from the end of the aperture adjacent to the container between the inner surface of the outer member and the outer surface of the sealing element, out through the aperture under the action of the suction.