A drink container including a liquid container having a neck with an opening and having an internal compartment sized to hold a volume of potable drink liquid and a cap assembly removably coupled to the liquid container, the cap assembly including a base removably coupled to the neck of the liquid container and including a through-passage extending through the base, a first catch structure coupled to the base, a mouthpiece assembly including a rigid collar member having second catch structure adapted to be selectively engaged with the first catch structure, and a user release mechanism adapted to automatically disengage the first and second catch structures upon actuation of the user release mechanism.