A bioreactor system includes a support housing having an interior surface bounding a compartment. A rack is secured to the support housing in alignment with the opening. An elongated first shaft has a first end and an opposing second end, the first end of the first shaft being secured to the rack. A structure is secured to the first shaft at or towards the second end of the first shaft, the structure outwardly projecting away from the first shaft. A collapsible bag bounds a chamber and is at least partially disposed within the compartment of the support housing. A member projects from the collapsible bag and passes through the opening on the support housing, the structure supporting or restraining movement of the member.