Abstract: A container and lid of molded plastic material is disclosed having an integral fastening structure for connecting the lid onto the container, the fastener structure amounting to two series of longitudinally and radially reversely inclined interengaging elements, each element supported by an adjacent longitudinal surface. A lower portion of the fastener structure on the container is configured to communicate with the interior of the container below any sealing line between the container and lid. A sealing bead is provided integral with or above the fastener structure. Where the sealing bead is integral with the fastener structure, it takes the form of a dual sealing bead interrupted by the elements of the fastener structure. The lid further includes a central disk constituting a major portion of the lid and at least one intermediate ring-shaped step connecting the central disk to the lower edge of the longitudinal surface on the periphery of the lid.