The  AirClean bags for the Miele uprights have an extra large, 6.3 quart capacity and now feature a redesigned self-sealing technology. With 9 Stage Filtration, these heavy duty bags now come with a spring loaded sealing feature to ensure dirt and allergens remained trapped inside the bag and work to eliminate the chance of spills while changing. They are self-closing with a hygienic seal, the the dirt stays put when changing the bag. So you do not breath in any dust or dirt that you just vacuumed up.The  U AirClean dust bags are heavy-duty - nine layers -so the dirt stays in the bag – no matter what you accidentally vacuum up! Pack contains 4 large dust lbags and 2 filters. 1 air clean filter and 1 pre motor filter. Fits all the  S7 Upright vacuums.Twist Jazz,Bolero,Calypso,Tango and Swing and Cat and Dog.