Container preform

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 support flange of the finish portion;
• a tip portion at a second end of the preform opposite to the first end, the tip portion configured to form a container base of the container;
• a neck portion adjacent to the support flange, the neck portion configured to form a neck portion of the container;
• an external stretch radius at an outer surface of the neck portion;
• an internal stretch radius at an inner surface of the neck portion, a first distance between the internal stretch radius and the external stretch radius is equal to, or greater than, four times a second distance between the external stretch radius and the support flange;
• a shoulder portion adjacent to the neck portion and configured to form a container shoulder of the container;
• and
• a body portion between the shoulder portion and the tip portion, the body portion configured to form a container body of the container.