The SEBO D series canister vacuum bags come with 8 three layer ultra bags and 8 sealing caps (to help contain pollutants upon bag disposal). The multi-layer bags are the first step in the filtration process, removing and trapping the bulk of your household pollutants. User need to change their bag regularly to help maintain high filtration standards and also help increase the lifespan / functionality of your motor. Genuine Part # 8120AM