High-quality materials: Made of 2 layers of fine fiber layer and 2 unpopular fabrics. Close to close: High-density fabrics can ensure that the dust bag is absolutely durable and will not be pierced by internal sharp debris. In addition, there is an open/close door that can prevent dust and pollen from escaping. Large scale design: The sliding door designed by the designer has a safe connector to ensure that any dirt accumulated in the dust accumulated in the dust of the iRobot Romberba i7 i7. For allergic reactions, this means removing allergens from fine dust in the indoor air. Healthy lifestyle: We recommend replacing the IroBot Roomba replacement kits every 2 to 3 months. This ensures the cleaning efficiency of a vacuum cleaner and reduces the amount of dust, pollen and other allergens that enter the air.