Abstract: A material savings container cap comprising a circular flat top having a perimeter, an annular segmented container cap wall, each separated segment of container wall descending from a different portion of the perimeter of the top, the container cap wall having an internal screw thread for interlocking with a container wall of the container neck wherein an angle of threading to the container cap wall is between approximately thirty degrees and approximately forty-five degrees. The container neck wall has an external screw thread having an angle to the container neck wall of approximately thirty degrees. The internal screw thread always points towards an inner surface of the top of the cap and towards an axis of rotation of the cap. In the container neck wall the external screw thread always points away from an opening of the container and away from an axis of rotation of the container neck.