Simplicity Style B Vacuum Bags (Genuine 3 Pack) #S7-3 Simplicity Type B Vacuum Bags. Item # S7-3 (3 pack of bags). Made By Simplicity. Designed to fit the following Simplicity Upright Vacuums: 7 Series (7700, 7750, 7850, etc.). 7000 Series (7200, 7250, 7300, 7350, etc.). Commercial Models (7400, 7450, 7900, 7950, etc.).