A drinking vessel has a cylindrical body (1) forming the main receptacle, and a lid (2) with a snap fit over the rim of the body. The lid has a mouthpiece (6) diametrically opposed to a vent (8) and when turned to one position both are blocked. But when turned to another position, both are opened to the interior of the body (1) by ducts (11) in an inner flange (10) of the lid registering with recesses (5) in the rim of the body.
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