A system for mixing a liquid solution or suspension comprising: (a) a container assembly comprising: a collapsible bag bounding a compartment and having an upper end 5 and an opposing lower end, the collapsible bag being comprised of a polymeric film and being adapted to hold a fluid; a sparger disposed at the lower end of the collapsible bag for delivering a gas into the compartment of the collapsible bag; an exhaust port secured to the upper end of the collapsible bag and bounding a port opening that extends therethrough and communicates with the compartment of the collapsible bag; and (b) a condenser bag (102, 102A, 102B) comprising: a body bounding a channel that extends between an inlet opening at a first end and an outlet opening at an opposing second end, the body being comprised of a polymeric film; and an intake port secured to the body at the inlet opening and bounding a port opening that extends therethrough and communicates with the channel, the intake port of the condenser bag being coupled with the exhaust port on the collapsible bag so that at least a portion of the body of the condenser bag is disposed at an elevation above the upper end of the collapsible bag, wherein the port opening of the intake port of the condenser bag and the port opening of the exhaust port of the collapsible bag each have a maximum diameter that is greater than 5 cm. (a) a container assembly comprising: a collapsible bag bounding a compartment and having an upper end 5 and an opposing lower end, the collapsible bag being comprised of a polymeric film and being adapted to hold a fluid; a sparger disposed at the lower end of the collapsible bag for delivering a gas into the compartment of the collapsible bag; an exhaust port secured to the upper end of the collapsible bag and bounding a port opening that extends therethrough and communicates with the compartment of the collapsible bag; and a collapsible bag bounding a compartment and having an upper end 5 and an opposing lower end, the collapsible bag being comprised of a polymeric film and being adapted to hold a fluid; a sparger disposed at the lower end of the collapsible bag for delivering a gas into the compartment of the collapsible bag; an exhaust port secured to the upper end of the collapsible bag and bounding a port opening that extends therethrough and communicates with the compartment of the collapsible bag; and (b) a condenser bag (102, 102A, 102B) comprising: a body bounding a channel that extends between an inlet opening at a first end and an outlet opening at an opposing second end, the body being comprised of a polymeric film; and an intake port secured to the body at the inlet opening and bounding a port opening that extends therethrough and communicates with the channel, the intake port of the condenser bag being coupled with the exhaust port on the collapsible bag so that at least a portion of the body of the condenser bag is disposed at an elevation above the upper end of the collapsible bag, wherein the port opening of the intake port of the condenser bag and the port opening of the exhaust port of the collapsible bag each have a maximum diameter that is greater than 5 cm. a body bounding a channel that extends between an inlet opening at a first end and an outlet opening at an opposing second end, the body being comprised of a polymeric film; and an intake port secured to the body at the inlet opening and bounding a port opening that extends therethrough and communicates with the channel, the intake port of the condenser bag being coupled with the exhaust port on the collapsible bag so that at least a portion of the body of the condenser bag is disposed at an elevation above the upper end of the collapsible bag, wherein the port opening of the intake port of the condenser bag and the port opening of the exhaust port of the collapsible bag each have a maximum diameter that is greater than 5 cm.