A container assembly having a body and a cover. The cover includes a cover rim having an inverted U-shape defining an outer flange and an inner flange separated by a top section, a lower part of the outer flange terminating in an end. The body includes a body rim defined by an upstanding inner wall and an upstanding outer wall joined to the inner wall by a top wall, a lower portion of the outer wall terminating in a gutter. The outer wall includes a recess and the outer flange includes a protrusion to enable a fitting of the protrusion into the recess. The outer flange includes a tab extending parallel to the top section and arranged at the lower part of the outer flange. The outer flange has weakening lines to allow a tear out of a section of the outer flange.