Abstract: A light-weight, one piece maintenance free, weather-resistant, stiff, warp and sag-proof planar molded plastics material cover or lid for containers has embossed portions defining hinge structure along the rear edge thereof, spaced transverse ribs across the width thereof and a longitudinal rib adjacent the front edge thereof merged into the transverse ribs. A peripheral lip is also formed around at least the front and sides. The lid or cover is substantially uniform in thickness, the embossed ribs are preferably U-shaped in cross section, and the embossed hinged structure has apertures forming bearings for a hinge rod.