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A molded plastic bottle has a base having an outside surface rotationally symmetric about a longitudinal axis of the bottle including a convex heel and a central concavity separated by a standing ring supporting the bottle on an underlying surface. The convex heel has an upper margin integrally form

A molded plastic bottle has a base having an outside surface rotationally symmetric about a longitudinal axis of the bottle including a convex heel and a central concavity separated by a standing ring supporting the bottle on an underlying surface. The convex heel has an upper margin integrally formed with the sidewall of the bottle and a lower margin defining an outer portion of the standing ring. The central concavity includes a first surface having a lower most portion defining an inner portion of the standing ring. The standing ring inner portion and outer portion intersect in an abrupt edge with the inner portion of the standing ring generally being inclined with respect to the plane at an angle of between about 30° and 50°.

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1. A molded plastic bottle having a sidewall and a bottom structure closing the container at a lower end portion of the sidewall, the bottom structure having an outside surface rotationally symmetric about a longitudinal axis of the bottle, the outside surface comprising:a convex heel having an uppe

1. A molded plastic bottle having a sidewall and a bottom structure closing the container at a lower end portion of the sidewall, the bottom structure having an outside surface rotationally symmetric about a longitudinal axis of the bottle, the outside surface comprising:a convex heel having an upper margin of diameter D integrally formed with the lower end portion of the sidewall and a lower margin defining an outer portion of a standing ring for supporting the bottle on any underlying surface, the standing ring outer portion having a vertical inside radius of curvature of at least about 0.04 D, anda central concavity including a first surface having a lower most portion defining an inner portion of the standing ring, the first surface having a vertical curvature radius of at least about 0.8 of D, the standing ring inner portion and outer portion intersecting in an abrupt edge defining a circle lying in a plane normal to said axis, the inner portion of the standing ring being inclined with respect to the plane at an angle of between about 30° and 50°. 2. A molded plastic bottle having a sidewall and a bottom structure closing the container at a lower end portion of the sidewall, the bottom structure having an outside surface rotationally symmetric about a longitudinal axis of the bottle, the outside surface comprising:a convex heel having an upper margin of diameter D integrally formed with the lower end portion of the sidewall and a lower margin defining an outer portion of a standing ring for supporting the bottle on any underlying surface, wherein the upper margin of the convex heel has a vertical inside radius of curvature of between about 0.7 and 0.8 D, the standing ring outer portion having a vertical inside radius of curvature of at least about 0.04 D, anda central concavity including a first surface having a lower most portion defining an inner portion of the standing ring, the first surface having a vertical curvature radius of at least about 0.8 of D, the standing ring inner portion and outer portion intersecting in an abrupt edge defining a circle lying in a plane normal to said axis, the inner portion of the standing ring being inclined with respect to the plane at an angle of between 20° and 60°. 3. A molded plastic bottle having a sidewall and a bottom structure closing the container at a lower end portion of the sidewall, the bottom structure having an outside surface rotationally symmetric about a longitudinal axis of the bottle, the outside surface comprising:a convex heel having an upper margin of diameter D integrally formed with the lower end portion of the sidewall and a lower margin defining an outer portion of a standing ring for supporting the bottle on any underlying surface, wherein the upper margin of the convex heel is located at between about 0.35 D and 0.40 D, above said plane containing the standing ring, the standing ring outer portion having a vertical inside radius of curvature of at least about 0.04 D, anda central concavity including a first surface having a lower most portion defining an inner portion of the standing ring, the first surface having a vertical curvature radius of at least about 0.8 of D, the standing ring inner portion and outer portion intersecting in an abrupt edge defining a circle lying in a plane normal to said axis, the inner portion of the standing ring being inclined with respect to the plane at an angle of between 20° and 60°. 4. A molded plastic bottle having a sidewall and a bottom structure closing the container at a lower end portion of the sidewall, the bottom structure having an outside surface rotationally symmetric about a longitudinal axis of the bottle, the outside surface comprising:a convex heel having an upper margin of diameter D integrally formed with the lower end portion of the sidewall and a lower margin defining an outer portion of a standing ring for supporting the bottle on any underlying surface, the standing ring outer portion having a vertical inside radius of curvature of between about 0.045 D and 0.095 D, anda central concavity including a first surface having a lower most portion defining an inner portion of the standing ring, the first surface having a vertical curvature radius of at least about 0.8 of D, the standing ring inner portion and outer portion intersecting in an abrupt edge defining a circle lying in a plane normal to said axis, the inner portion of the standing ring being inclined with respect to the plane at an angle of between 20° and 60°. 5. A molded plastic bottle according to any of claim 1, 2 , 3 or 4 wherein the central concavity further comprises a second surface having an outer margin spaced uniformly inward from the standing ring and integrally formed with the first surface. 6. A molded plastic bottle according to claim 5 wherein the second surface is downwardly convex and including a lowermost point coincident with the longitudinal axis and spaced from said plane. 7. A molded plastic bottle according to claim 6 wherein the space between the lowermost point and the plane is between about 0.05 D and 0.3 D. 8. A molded plastic bottle according to claim 6 wherein the second surface has a radius of curvature of between about 0.25 D and 0.85 D. 9. A molded plastic bottle according to claim 5 wherein the outer margin of the second surface is positioned between about 0.1 D and 0.3 D from the longitudinal axis of the bottle. 10. A molded plastic bottle according to any of claim 2, 3 , or 4 wherein the inner portion of the standing ring is inclined with respect to the plane at an angle of between about 30° and 50°. 11. A molded plastic bottle according to claim 10 wherein the inner portion of the standing ring is inclined with respect to the plane at an angle of about 40°. 12. A molded plastic bottle according to any of claim 1, 2 , 3 , or 4 wherein the standing ring circle has a diameter of between about 0.7 D and 0.8 D. 13. A molded plastic bottle according to any of claim 1, 2 , 3 , or 4 wherein the first surface has a vertical curvature radius that is infinite so that the first surface is a conical portion. 14. A molded elastic bottle according to any of claim 1, 3 or 4 wherein the upper margin of the convex heel has a vertical inside radius of curvature of between about 0.7 and 0.8 D. 15. A molded plastic bottle according to any of claim 1, 2 or 4 wherein the upper margin of the convex heel is located at between about 0.35 D and 0.40 D, above said plane containing the standing ring. 16. A molded plastic bottle according to any of claim 1, 2 or 3 wherein the standing ring outer portion vertical inside radius of curvature is between about 0.45 D and 0.095 D. 17. A molded plastic bottle having a sidewall and a bottom structure closing the container at a lower end portion of the sidewall, the bottom structure having an outside surface rotationally symmetric about a longitudinal axis of the bottle, the outside surface comprising:a convex heel having an upper margin of diameter D integrally formed with the lower end portion of the sidewall and a lower margin defining an outer portion of a standing ring for supporting the bottle on any underlying surface, the standing ring outer portion having a vertical inside radius of curvature of between about 0.045 D and 0.095 D, anda central concavity including a first surface having a lower most portion defining an inner portion of the standing ring and a second surface having an outer margin spaced uniformly inward from the standing ring and integrally formed with the first surface, the second surface being downwardly convex and including a lowermost point coincident with the longitudinal axis and spaced from any underlying supporting surface, the first surface having a vertical curvature radius of at least about 0.8 of D, the standing ring inner portion and outer portion intersecting in an abrupt edge defining a circle lying in a plane norma l to said axis, the inner portion of the standing ring being inclined with respect to the plane at an angle of between about 30° and 50°. 18. A molded plastic bottle according to claim 17 wherein the upper margin of the convex heel is located at between about 0.35 D and 0.40 D, above said plane containing the standing ring, and has a vertical inside radius of curvature of between about 0.7 and 0.8 D. 19. A molded plastic bottle according to claim 17 wherein the second surface has a radius of curvature of between about 0.25 D and 0.85 D, and the space between the lowermost point of the second surface and the plane containing the standing ring is between about 0.05 D and 0.3 D.