Abstract: A container movable between inverted and non-inverted configurations includes a dispenser body having an upper opening and a hollow interior. The container further includes an automatically opening and closing mechanism for controlling fluid flow disposed between the upper opening and the hollow interior, permitting fluid flow from the interior through the upper opening in the inverted configuration and preventing fluid flow from the interior through the upper opening in the non-inverted configuration. This fluid flow mechanism permits a user to drink while preventing backflow of fluid into the container.