This performance package features 16 self-closing genuine Type U bags that hold 5.45 quarts of dirt and debris. Compatible with all Miele upright vacuums from the Dynamic U1 Series. Also included is the Miele SF-HA30 HEPA AirClean Filter that traps 99.95% of all particles down to 0.3 microns in size. Should be replaced once a year or equivalent to 50 hours of use. Features timestrip indicator that gradually changes from green to red to let you know when the filter needs to be replaced.