18 MICROFILTRATION VACUUM BAGS DESIGNED TO FIT SIMPLICITY TYPE F VACUUMS (F3300,F3400, F3500, F3600 AND SF1. ALSO FITS RICCAR RSL1A, RSL3, RSL4, RSL3C. THIS LISTING IS FOR 3 PACKS EACH WITH 6 BAGS. THESE BAGS ARE THE BEST QUALITY REPLACEMENT MICROFILTRATION BAGS AVAILABLE. MICRO BAGS HAVE 99.7% FILTRATION AND ARE A MUST FOR ANY ALLERGY SUFFERER BUT AT THIS PRICE EVERYONE SHOULD USE THEM.