a plastic container includes a plastic body having a polygonal sidewall contour with rounded corners on a cylinder of revolution and flat panels extending between the corners chordally of the cylinder of revolution . in the preferred embodiments of the invention , a label is disposed on an exterior surface of at least one of the flat panels , and most preferably extends circumferentially around the exterior surface of the container sidewall . upon filling the container with hot liquid and capping the container , the flat panels bow radially inwardly as the liquid cools . however , any labeling placed on the container , either before or after cooling , is secured to the panels as well as the rounded corners , and does not wrinkle or crinkle during storage or use .