Method of forming container with a tool having an articulated section

A method of forming a container from a construct, the method comprising:

• obtaining a tool having a cavity, a core, and an articulated section for stabilizing a position of the construct in the tool and for being moveable within the cavity relative to the cavity and the core, the cavity having at least one sidewall surface, the articulated section having a sidewall surface aligning with the at least one sidewall surface of the cavity, the sidewall surface of the articulated section and the at least one sidewall surface of the cavity are each configured to form a portion of at least one sidewall of the container;
• placing a construct between the cavity and the core;
• moving the core relative to the cavity to form the interior space of the container so that the articulated section at least partially initially grips a portion of a sidewall of the construct;
• and
• further moving the core into the cavity for further forming the construct into the container, the portion of the sidewall of the construct remaining gripped by the articulated section in the cavity during the further moving of the core, the further moving the core into the cavity comprises forming the at least one sidewall of the container by pressing the at least one sidewall of the container in contact with the sidewall surface of the articulated section and the at least one sidewall surface of the cavity when the core is moved into the cavity.