Abstract: The present invention relates to a container of fiber pulp for packaging of food, such as vacuum packaging or modified atmosphere packaging. The container comprises a bottom part and side walls surrounding said bottom part and has at an upper end thereof a circumferential longitudinal rim part having a planer main surface being substantially parallel to the bottom plane and defining an opening of the container. The side walls further comprise a reinforcing element below the longitudinal rim part for generating an increased moment of inertia of the rim part along the longitudinal direction thereof.