the present invention is directed to an oxygen - level controlled , modified atmosphere package consisting of a cup and a lid preferably in the form of a dome . in one preferred embodiment , the dome is not sealed to the flange of the cup , but rather extends circumferentially around such flange and with a hermetically sealed diaphragm disposed over the top opening in said cup . the interior of the package is designed to contain food and other perishable components having defined metabolizing characteristics . the package polymers are controlled to provide a selected environment for preserving the freshness of foods packaged in a modified gas atmosphere sealed inside the package with the food . the invention incorporates various mechanically enhanced characteristics , as well as offering enhanced safety with package tamper evidence visible to the consumer .