The collection consists of two stackable casseroles and a jug for microwave cooking. The casseroles have vent openings at the edge of the lid so that the steam can escape and no vacuum is created when cooling. Separate, fresh-keeping lids make it possible for the food afterwards to be cooled down or frozen in the same container. The interiors of all containers are made better for use by rounding off the corners. The ergonomic handles provide safe handling.