Box-shaped containers of plastics material

A plastic box-shaped container molded in one piece as an injection molded part, comprising:

• an upper surface of a planar generally horizontal bottom being integral with a bottom edge of a continuous vertical wall, a lower surface of the bottom being integral with top ends of generally vertical first and second stiffening ribs and additional generally vertical ribs;
• bottom ends of the additional vertical ribs being integral with an upper surface of a generally horizontal web having a set of four integral peripheral outer edges and a set of four integral inner edges, the additional ribs extending from the outer edge of the web to a point inward of the inner edge;
• and
• parallel first ribs and parallel second ribs each inwardly spaced from said integral inner edges of said web and extending from a point inward of an inner edge of the web to another point inward of an opposite inner edge of the web such that the outermost first and second ribs are integral with and extend generally perpendicular to the innermost edges of the additional ribs, the first and second ribs being generally perpendicular to each other, the number of said additional ribs extending parallel to said first ribs or said second ribs being greater than the number of said first ribs or said second ribs, and through passages existing between adjacent additional ribs extending from outside the peripheral outer edges of said web to inside the inner edges of said web.