Effectively prevent the liquid inside the container from volatilization, outside the water molecules and particles into the packaging container, reducing the loss brought about by volatilization, to ensure the purity of the liquid in the cavity. Pressure relief and ventilation, reduce the pressure inside the cavity, reduce the temperature inside the cavity, avoid the packaging container to withstand excessive pressure and collapse. Rapid air exchange solves the pressure balance between inside and outside of the packaging container, and improves the sealing safety performance of the packaging container.