Container with valve

A food container, comprising:

• a base for holding food or beverage and including at least one side wall extending upwardly to an upper rim;
• a cover sized and shaped to engage said upper rim and define a closed interior;
• one of said base or said cover including an aperture extending therethough;
• and
• a vent element having a main panel formed of an elastic material and including first and second sections, an inner face of said first section being secured to said one of said base or said cover at a position such that an inner face of said second section may overlie said aperture;
• wherein said main panel of said vent element including an outwardly curved section between said first section and said second section, such that in an undeformed state said second section of said main panel is spaced from said container;
• wherein said vent element further includes a plug extending therefrom at a position to enter said aperture upon manual inward deformation of said main panel, said plug including a shaft and an enlarged head, wherein said shaft has a diameter less than that of said aperture, and a length greater than a depth of said aperture;
• wherein said main panel exerts an outward elastic strain force pressing said head against said one of said base and said cover, and the main panel is designed to allow inward flexing during undesired under-pressure within said container whereby said enlarged head breaks contact with said one of said base and said cover and creates a valve vent condition to relieve said under-pressure.