Genuine Hoover "Type Y" Filtrete® HEPA Filtration Bags to keep your Hoover 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 upright cleaners, including the WindTunnel uprights, that use "Type Y" or "Type Z" bags.   For similar products see our list of Hoover Vacuum Supplies.