The invention relates to a packaging bag for the sterilisation of food, comprising walls on which a closing device is arranged comprising complementary closing profiles, said bag being characterised in that: the material constituting the walls has a softening point above 100° C., andthe complementary closing profiles are adapted to hermetically seal the bag when it is placed in an atmosphere of temperature above 80° C.The invention also relates to a method of sterilising food products by use of such a bag.
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