Canister vacuum bags fit compatible canister vacuums to collect materials picked up during vacuuming.,Vacuum bags collect vacuumed dust and debris for disposal. They also help filter out allergens and dust particles to prevent them from recirculating in the air. New or empty vacuum bags help prevent clogs, suction loss, and motor burnout. These bags typically fit specific vacuum cleaner brands or models. Disposable bags are discarded when full and replaced with a new bag to minimize contact with collected dirt. Reusable bags are shaken out when full and used again to reduce waste.