Fuente: WIPO "milk" A packaging material and a container as a packaging means for beverage and food heated for intake by a microwave oven which can provide the least risk of bumping or boilover during heating without taking measures such as unpacking them or making holes in them before heating, wherein the covers of the packaging material and container comprises a nonpermeable material basic body having a gas discharge hole and a nonpermeable cover body which covers the gas discharge hole and is stuck on one surface of the basic body, and the cover body or a part of the cover body is stuck to the basic body at such a sticking strength that it is peeled off when a pressure of excess gas produced from a packaged food and beverage acts on the cover body through the gas discharge hole.