A fluid mixing system includes a container bounding a compartment and extending between a first end and an opposing second end. An elongated first drive line and second drive line are disposed within the compartment of the container and are rotatable therein. At least one tie extends between the first drive line and the second drive line so as to maintain at least a portion of the first drive line and the second drive line at lateral spaced apart positions within the compartment. An impeller or other mixing element can be coupled to the drive lines.

The present disclosure provides a fluid delivery consumable for delivering a fluid dose to a bioreactor. The fluid delivery consumable includes a vial for holding the fluid dose, a plunger, and a connector. The vial includes an outlet and an open end opposite to the outlet. The plunger is engaged with the open end and operable to urge the fluid dose toward the outlet. The connector is proximal to the outlet and attachable to the bioreactor. The connector is adapted to transfer the fluid dose from the vial to the bioreactor when the plunger is operated to urge the fluid dose out of the outlet of the vial.