Variable displacement container base

The present invention is directed to an improved variable displacement container base which can accommodate different rates of cooling of liquids dispensed in a container. To achieve an improved variable displacement container base the present invention provides A base for a container, the base comprising: an outer support wall; a support surface extending inwardly from the outer support wall and defining a reference plane; an inner support wall extending upwardly from the support surface; a first radiused portion extending radially inward from the inner support wall and concave relative to the reference plane; a second radiused portion extending radially inward from the first radiused portion and convex relative to the reference plane; an intermediate surface extending radially inward from the second radiused portion and substantially parallel to the reference plane; a third radiused portion extending radially inward from the intermediate surface and convex relative to the reference plane; a central portion disposed proximate the third radiused portion, the central portion including an inner core having a sidewall and a top surface extending from the sidewall, the top surface having a convex portion relative the reference plane; and a transition portion between the third radiused portion and the inner core; as well as a container including such a base.