A plastic container having a base portion adapted for vacuum pressure
absorption. The base portion including a contact ring that supports the
container, an upstanding wall, and a central portion. The upstanding wall
being adjacent to and generally circumscribing the contact ring. The
central portion defined in at least part by a pushup and an inversion
ring that generally circumscribes the pushup. The pushup having a
generally truncated cone shape in cross section and the inversion ring
having a generally S shaped geometry in cross section. The pushup and the
inversion ring being moveable to accommodate vacuum related forces
generated within the container.