A method for sterilizing cuboid-shaped cardboard/plastic combipacks in an autoclave, with the packs including product and packing are subjected to heat treatment at a certain temperature over a certain period of time, the product including a liquid and chunky portions, and mechanisms are provided inside the autoclave to drive the packs rotationally about a rotational spindle, and a cuboid-shaped cardboard/plastic combipack for use in such a device.A plurality of packs are arranged closely adjacent to one another in parallel rows, to be arranged on support floors and for a plurality of support floors loaded with packs to be arranged one above the other and fixed in their mutual positions. The cardboard for the pack used therewith is made water-repellent by means of glue to reduce the intake of water.