Abstract: A container body with a lid hingedly joined thereto for movement about a pivot axis utilizing an elastomeric spring of generally ellipsoidal configuration extending transversely across the pivot axis and having opposed ends seated within the container body and lid, the spring folding centrally at the area of maximum thickness with the elastic deformation biasing the lid to its open position upon release of the closing force on the lid. The pivotal hinge assembly is enclosed by an integral transversely extending handle panel outward of the hinge assembly.