A cap assembly for a container, including a base defining a base plane, a drink spout separate from the base and extending away from the base, a closure configured to selectively transition between a closed configuration, in which the closure is engaged with the drink spout and obstructs a passage through the drink spout, and an open configuration, in which the closure is not engaged with the drink spout and does not obstruct the passage through the drink spout, and a closure retention mechanism configured to retain the closure in any one of a plurality of stowed positions against the base.