Drinking vessel with closure assembly

A drinking vessel comprising:

• a beverage container having a spout, the spout defining a first drinking opening and a second drinking opening;
• and
• a closure assembly attachable to the beverage container, the closure assembly comprising:
• a positioning member;
• a sealing member;
• and
• a cap,
• wherein:
• when the closure assembly is not in a sealing position, the positioning member, the sealing member, and the cap are rotatable as a unit,
• when the positioning member is in a sealing orientation, the closure assembly can be lowered into the sealing position,
• when the closure assembly is in the sealing position, the cap is rotatable relative to the spout while the positioning member and the sealing member remain rotationally stationary relative to the spout,
• when the closure assembly is in the sealing position, the cap can be attached to the beverage container by rotating the cap so that threads located on the cap engage with threads located on the beverage container, and
• attaching the cap to the beverage container by engaging the threads located on the cap with the thread located on the beverage container, compresses the sealing member between the cap and the spout, thereby sealing the first drinking opening and the second drinking opening.

A method for sealing a drinking vessel, comprising:

• lowering a closure assembly over a spout of a beverage container having a first drinking opening and a second drinking opening, wherein lowering the closure assembly lowers a positioning member of the closure assembly into a positioning aperture of the spout;
• rotating the closure assembly in an engagement direction, wherein rotating the closure assembly in the engagement direction causes the positioning member and a sealing member to rotate toward a sealing orientation;
• when the positioning member reaches the sealing orientation, further lowering the closure assembly towards the spout so that threads of the closure assembly can engage with threads of the beverage container;
• and
• further rotating the closure assembly in the engagement direction while the positioning member and the attached sealing member remain in the sealing orientation,
• wherein engagement of the threads during the further rotating of the closure assembly causes the sealing member to seal the first drinking opening and the second drinking opening,
• wherein further lowering of the closure assembly towards the spout is prevented by the positioning member when the positioning member is not in the sealing orientation.