Genuine Hoover "Type S" Filtrete® HEPA Filtration Bags to keep your Hoover canister vacuum cleaner performing well. Contains two high filtration bags constructed with three layers of Filtrete filter media. Filtrete® is a trade mark and product by 3M. For Hoover canister vacuums that use "Type S" bags, including the Futura, Spectrum and Constellation   For similar products see our list of Hoover Vacuum Supplies.