Abstract: A collapsible beverage containment assembly includes a bottle. The bottle has an outer wall extending between a top end and a bottom end of the bottle to contain a carbonated fluid. The outer wall is structured such that the bottle is collapsible. A sleeve is coupled to the bottom end. The sleeve is positioned within an interior of the bottle. A lid is movably coupled to the top end so the lid may be rotated. A screw is coupled to the lid such that the screw extends downwardly into the bottle. The screw engages the sleeve. Thus, the outer wall is collapsed when the lid is rotated to reduce a volume of the bottle, preserving the carbonation in the carbonated beverage.