Preform design for lightweight container

A preform configured to form a container by stretch blow molding, the preform comprising:

• a finish portion at a first end of the preform, the finish portion is a container finish of the container;
• a tip portion at a second end of the preform opposite to the first end, the tip portion configured to form a container base and a container heel of the container;
• and
• an outer surface of the tip portion including a flat surface, a first radius on a first side of the flat surface, a second radius between the first radius and the flat surface, a third radius extending from the flat surface on a second side of the flat surface, and a fourth radius extending from the third radius towards the second end of the preform through which a longitudinal axis of the preform extends;
• wherein the fourth radius is greater than the third radius.

A preform configured to form a container by stretch blow molding, the preform comprising:

• a finish portion at a first end of the preform, the finish portion is a container finish of the container;
• a tip portion at a second end of the preform opposite to the first end, the tip portion configured to form a container base and a container heel of the container;
• and
• an outer surface of the tip portion including a flat surface, a first radius on a first side of the flat surface, a second radius between the first radius and the flat surface, a third radius extending from the flat surface on a second side of the flat surface, and a fourth radius extending from the third radius towards the second end of the preform through which a longitudinal axis of the preform extends;
• wherein the tip portion is most thin at the second end through which the longitudinal axis extends;
• and
• wherein the tip portion gradually increases in thickness as the tip portion extends outward from the longitudinal axis.