Package with microwave induced insulation chambers

An insulating microwave cooking package containing a compartment for heating food in a microwave oven, comprising:

• at least inner and outer superimposed sheets of packaging material as a wall of the package, at least one of said sheets in the package wall being sufficiently flexible to change shape during microwave heating;
• a microwave interactive susceptor layer positioned between said sheets and connected to the inner superimposed sheet of the package wall;
• means connecting selected portions of the sheets together;
• said package having at least one unsealed areas comprising sealed lines, dots or patches between the susceptor layer and the outer sheet to provide a plurality of flattened inflatable chambers between the sealed areas as a potential site for a plurality of inflated chambers separate from said compartment;
• said inflation chambers are located in heat transfer relationship with the susceptor;
• said inflation chambers are located between the susceptor and said outer sheet of the package;
• the heat produced by the susceptor is adapted to expand the inflation chambers without placing moisture or other expandable material therein prior to heating;
• and
• said inflation chambers provide insulating spaces between the susceptor and said outer sheet of the package to form a thermal barrier for reducing heat loss from the package to thereby significantly enhance the cooking of the food.