EnviroCare Replacement Micro Filtration Vacuum Cleaner Dust Bags made to fit Modern Day 12 Gallon Central Vacuums 3 Pack | | Designed to fit Air Force, Silent Master, MD, AirFlow CFM, Stor-Vac, and Modern Day units over 34 inches tall (total length) | | Replaces OEM # 721H | | Although this bag may seem big, it was designed this way. After inserting the bag open it up inside the vacuum by pushing down and out from the sides. | | Electrostati