Better filtration means cleaner air less dusting longer secondary filter life at considerable savings. It includes 4 packs of 3 bags. The inner layer of bag material thats built intothe higher efficiency bag is improves filtration durability andimproves vacuum efficiency. Vacuum 12. This is a 12 brand new High Filtration Style C bags that fit on any of the Metal Tank Electrolux Canister Models. Pu1 Vacuum Cleaner Bags 12.