A packaging laminate for a retortable packaging container for a food in which the packed food may be stored and, after storage, be heated by microwaves without the packaging container first needing to be opened. The packaging laminate has a core layer and outer, liquid-tight thermoplastic coatings which withstand heating in a retort. Between the core layer and one of the outer coatings, the packaging laminate has a gas barrier film bonded to the core layer. To increase the internal cohesion of the packaging laminate between the layers as well as the tightness properties of the packaging laminate against gases, the film displays, at least on one side, an outer coating of a water-soluble adhesion-promoting polymer component, preferably a modified polyacrylic acid and a water-soluble barrier-increasing polymer component, preferably a polyvinyl alcohol, in a coating quantity of between 1 and 3 g/m2, such as, for example, 1.6 g/m2.