Hoover recommends in each model's owner's manual that genuine replacement parts will assure peak performance. Look for the Hoover trademark on all bags, belts, and cleaning solutions, Hoover vacuum cleaner bags are retailed directly from Hoover's web site. If you're looking for standard bags, Hoover's got you covered. The Standard A, E, C, D bag for all the Dial-a-matics, C, H, and J bags are still available. The commercial bag is in stock; as are the K, L, M. N, R, S, and Z bags. The H30+ bag is in stock, although the canister bags are backordered and shipping may be delayed. In terms of allergen bags, Hoover's web site offers the A, K, S, Y, and Z allergen bags in three-packs; the allergen filter bag; and a genuine Hoover HEPA filtration type Y filter bag as well as a HEPA filter bag. By the way, if you've ever wondered, both Hoover's Bagless and WindTunnel Bagless models of vacuum cleaners use the same HEPA filter. The Bagless has either a 6.9 amp motor, or a 12 amp motor, and is designed so that the carpet debris goes through the motor and into the chamber. If you want to use the tools, slide an indicator knob. The WindTunnel bagless vacuum cleaner comes only in the 12 amp model, and has been designed so that the debris bypasses the motor as it goes directly into the chamber. If you want to use the additional tools, you don't need to adjust the vacuum; just make sure that the handle is in the upright and locked position.