The Miele AirClean 3D Efficiency Dustbags are equipped with an Auto-Seal™, self-locking collar that keeps microscopic dust and allergens safely trapped inside, so you never have to worry about releasing the lung-damaging particulates, dust and allergens you just captured back into the air, even during disposal. The New Soft Structure allows your vacuum to operate efficiently while using a lower suction setting. For use with the following Miele canister vacuum cleaners: S200 series, S300 series, S500 series, S4000 series, S6000 series, Compact C1, & Compact C2 Series Canister Vacuums.