An ion guide with two or more ion focusing elements and a gas channeling sleeve is described. An ion transport space within the gas channeling sleeve is in fluid communication with a pumping port. A suction device is used to suction gas out of the ion transport space through the pumping port establishing a gas flow. Ions in the ion transport space are transported from an ion entry end to an ion exit end of the ion guide by the gas flow. Several examples include a multipole ion guide in which rods are used as ion focusing elements. The gas channeling sleeve is fitted about the rods. In another example, toroidal or ring shaped ion focusing elements are used as ion focusing elements. In another example, a set of ion focusing rings are mounted between insulators to form a cylinder with a gas impermeable side wall. The cylinder is itself used as the gas channeling sleeve.