The mark consists of a container in the shape of a rectangle along its primary axis and square in cross-section along a plane perpendicular to the primary axis with a circular opening at the top and a recessed hand grip section, each side of the grip section being formed by a planar inner wall recessed inwardly from the respective container side wall to form a laterally extending skirt bounding the planar inner wall on three sides with the rear portion of the skirt extending downwardly and outwardly toward the front of the container, the planar inner walls having ribs configured to parallel the rear skirt portion..