[Good Sealing] - The dust bag is made of melt-blown fabric and non-woven fabric, combined with the cleaning station can effectively capture 99.7% of ultra-fine dust down to 0.3 tiny particles. [Auto Lock] - It will lock automatically when you lift the dust bag, completely sealing the dust bag inlet to ensure dust and dirt stay inside the bag. [Tips for Use] - In order to keep your robot running at its best, please clean and replace parts in time. If you have allergies and pets at home, it is recommended to replace the dust bag every 2-3 weeks. Large capacity: The dust bag has a large holding space, which can collect more dust and reduce the cleaning frequency. Easy to replace: dust bag design is simple and easy to use, easy to replace, no special tools or professional skills are required. Type:Dust Bags Replacement for Xiaomi Mijia M40S / OV31CN Vacuum Cleaner Compatible Models:Compatible For XiaoMi mijia M40S / OV31CN Quantity:10PCS/12PCS/20PCS Color:White Material:Non-woven fabric Package Contents: 10 * Dust Bag / 12 * Dust Bag / 20 * Dust Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.