a heavy - duty plastic molded single - cell beverage case provided with a plurality of columnar support members extending from the upper stacking rim to the bottom of the case for transmitting and withstanding high compressive stacking forces , the support members defined by a ribbed structure . a plurality of horizontal ribs , an upper rectangular panel and triangular gusset plates disposed at the junction of the columnar members and said panel enhance the structual rigidity and strength of the case .