Miele Genuine FJM AirClean 3D Efficiency bags feature a self-closing hole with 9 stage filtration, ideal for allergy sufferers. The 3D design allows them to hold more dirt by opening in the shape of a microwave popcorn bag. Unlike traditional flat bags this significantly increases their abilitiy to hold more dirt. They also feature a protective netting for extra strength. Fits S241-S256i, S290 - S299, S300i - S399, S500 - S578, S700 - S799, S4000 - S4999, S6000 - S6999, Compact C1, Complete C1, and Compact C2 series models. Also includes 1 pre-motor filter and 1 super air clean post motor filter. Genuine Part - Miele 7291640 For optimum performance and minimal foul odour, change bag every 1-2 months or when 3/4 full. Store vacuum bags in a clean, dry place.