Abstract: The present invention relates to a cap body operable to be removably coupled to a distal end of the container in a hermetically sealed configuration, wherein the cap body includes a button or nodule cover, a cap channel defined and surrounded by the cap body, and a gas discharge port defined on an outer surface of the cap body. The cap body includes a valve assembly disposed within the cap channel and has a longitudinally biased valve stem, wherein the valve stem has a static position with the distal valve end disposed proximal to the button or nodule cover and with the valve assembly in hermetically sealed configuration with the cap body to fluidly uncouple the first channel end and the container cavity and a gas-evacuation position with the distal valve end in a depressed position to fluidly couple the container cavity, the gas discharge port, and ambient environment.