This product fits a wide range of sweeper models including Roborock S7 series, S8 series, Q7 series, Q5 series, T8 and more. It features a high-quality rubber seal that ensures a better fit between the dust collection bag and the inlet to prevent dust leakage. The dust collection bag has a multi-layer filtration design made of a combination of non-woven and meltblown fabrics, effectively blocking 99.99% of dust and dirt, providing a cleaner environment for the home. Each dust bag has a capacity of 3 litres and can be used for up to 7 weeks, enough to store a large amount of dust. The portable push-pull handle design allows for easy replacement without direct access to the dust.