Maximise the performance of your Miele vacuum cleaner by using official Miele HyClean 3D Efficiency Dustbags. These dustbags have an Auto shut mechanism which automatically closes the bag when the vacuum cleaner is open. This retains more fine dust and small particles than any other conventional dust bag and allows you for vacuum for up to 20% longer before it needs replacing.Suitable for S7 and Dynamic U1 upright vacuum cleaners.