A lid for use with a drink container body having an inner body portion defining an interior fluid passageway with an upper end opening, comprising: an upper member positionable within the fluid passageway; a lower member positionable within the fluid passageway adjacent to the upper member; a ring seal positioned between the upper member and the lower member, the ring seal being outward stretchable from a first perimeter size to a second perimeter size different than the first perimeter size; and an actuator member operatively connected to the upper and lower members (246, 248) and operable to selectively move the upper and lower members (246, 248) relative to each other in a first direction to change the ring seal from the first perimeter size to the second perimeter size and position the ring seal in fluid-tight sealing engagement with the inner body portion when the lid is positioned in the fluid passageway, and move the upper and lower members (246, 248) relative to each other in a second direction different than the first direction to change the ring seal from the second perimeter size to the first perimeter size and position the ring seal out of fluid-tight sealing engagement with the inner body portion when the lid is positioned in the fluid passageway, characterized in that the upper member has a drink dispensing aperture, and when the actuator member moves the upper and lower members (246, 248) in the first direction and positions the ring seal in fluid-tight sealing engagement with the inner body portion, drink in the container body below the upper member is prevented from being dispensed through the drink dispensing aperture when the container body is tilted. an upper member positionable within the fluid passageway; a lower member positionable within the fluid passageway adjacent to the upper member; a ring seal positioned between the upper member and the lower member, the ring seal being outward stretchable from a first perimeter size to a second perimeter size different than the first perimeter size; and an actuator member operatively connected to the upper and lower members (246, 248) and operable to selectively move the upper and lower members (246, 248) relative to each other in a first direction to change the ring seal from the first perimeter size to the second perimeter size and position the ring seal in fluid-tight sealing engagement with the inner body portion when the lid is positioned in the fluid passageway, and move the upper and lower members (246, 248) relative to each other in a second direction different than the first direction to change the ring seal from the second perimeter size to the first perimeter size and position the ring seal out of fluid-tight sealing engagement with the inner body portion when the lid is positioned in the fluid passageway, characterized in that the upper member has a drink dispensing aperture, and when the actuator member moves the upper and lower members (246, 248) in the first direction and positions the ring seal in fluid-tight sealing engagement with the inner body portion, drink in the container body below the upper member is prevented from being dispensed through the drink dispensing aperture when the container body is tilted.