Abstract: A pizza box lid has a plastic support device centrally mounted to its underside. The device has a mounting portion adhesively attached to the lid, and a post portion which is originally coplanar with the mounting portion and flat against the underside of the lid. The post portion has two panels, one of the two panels being hinged to the mounting portion and the other panel being hinged to the one panel. The entire support is formed from one homogeneous piece of material which is appropriately scored to define the hingedly connected mounting and panel portions. The post portion is folded about the hinge relative to the mounting portion and away from the lid to an erect position generally perpendicular to the lid, and then one panel is folded relative to the other panel so as to prop the panels perpendicular to the lid whereby they serve as a support post to prevent the lid from sagging when the lid is closed.