The SR bag is for the Hoover Duros & Maytag Legacy vacuums, which were made by Sanyo for Hoover. They are paper micro filtration bags. The S bags fit the earlier Hoover canisters....Futura, PowerMax, TurboPower...lots of different names were used, as well as the Hoover Windtunnel Anniversary Edition canister & the Hoover Envy canisters.
Rob
