A device includes a pump body that has at least one variable-size compartment. The pump body is configured to be actuated to change the size of the at least one variable-size compartment. Flexible bladders are disposed in the at least one compartment. At least one common port is fluidly connected with interiors of the flexible bladders. The change in the size of the at least one variable-size compartment either compresses or expands the flexible bladders in unison and thereby, respectively, either expels the interiors through the at least one common port or draws a vacuum into the interiors through the at least one common port.