A cap assembly for a drink container that includes a liquid container having a neck with an opening and having an internal compartment configured to hold a volume of potable drink liquid, the cap assembly comprising: a base configured to be selectively coupled to the neck of the liquid container; a drink spout extending from the base and defining a passage for dispensing the potable drink liquid; a closure configured to be selectively transitioned between a closed configuration and a stowed configuration via an open configuration; a magnetic closure retention mechanism to magnetically retain the closure in the stowed configuration; and a tether that operatively couples the closure and the base; wherein in the closed configuration, the closure is operatively coupled to the drink spout and restricts flow of the potable drink liquid through the passage; wherein in the open configuration, the drink spout is unobstructed by the closure and the closure is spaced apart from the drink spout to permit flow of the potable drink liquid through the passage; wherein in the stowed configuration, the drink spout is unobstructed by the closure, the closure is spaced apart from the drink spout to permit flow of the potable drink liquid through the passage, and the closure is magnetically retained against the base by the magnetic closure retention mechanism; wherein the tether constrains the closure to travel along a predefined closure path as the closure transitions between the closed configuration, the open configuration, and the stowed configuration and the closure path extends at least substantially within a predefined closure plane; and wherein the closure is configured to rotate with respect to the tether to permit the closure to be screwed onto and off of the drink spout. a base configured to be selectively coupled to the neck of the liquid container; a drink spout extending from the base and defining a passage for dispensing the potable drink liquid; a closure configured to be selectively transitioned between a closed configuration and a stowed configuration via an open configuration; a magnetic closure retention mechanism to magnetically retain the closure in the stowed configuration; and a tether that operatively couples the closure and the base; wherein in the closed configuration, the closure is operatively coupled to the drink spout and restricts flow of the potable drink liquid through the passage; wherein in the open configuration, the drink spout is unobstructed by the closure and the closure is spaced apart from the drink spout to permit flow of the potable drink liquid through the passage; wherein in the stowed configuration, the drink spout is unobstructed by the closure, the closure is spaced apart from the drink spout to permit flow of the potable drink liquid through the passage, and the closure is magnetically retained against the base by the magnetic closure retention mechanism; wherein the tether constrains the closure to travel along a predefined closure path as the closure transitions between the closed configuration, the open configuration, and the stowed configuration and the closure path extends at least substantially within a predefined closure plane; and wherein the closure is configured to rotate with respect to the tether to permit the closure to be screwed onto and off of the drink spout.