A ventilator system (10) is disclosed herein. The ventilator system (10) includes a collapsible reservoir assembly (18) comprising an outer reservoir (26) and an inner reservoir (24) disposed at least partially within the outer reservoir (26). The ventilator system (10) also includes a source of gas (12) pneumatically coupled with the outer reservoir (26), and a controller (16) operatively connected to the source of gas (12). The controller (16) is configured to regulate the transmission of gas from the source of gas (12) to the outer reservoir (26) in order to compress the inner reservoir (24) and thereby automatically transfer the contents of the inner reservoir (24).
