Dreame Dust Collection Bag for Aqua Series, X50/X40 Ultra, L40SU/L40SPU, L30US & L10SPUHHigh CapacityA huge 3L capacity provides up to 60 days of hands free cleaning (based on testing in the dreame lab . Performance may vary in different environments). Locks in DustThe dust bag is thoroughly sealed as soon as you take it out of the base to prevent spilling and keep dust from floating up into the air. Easy to ReplaceJust remove the dust bag, toss it out, put in a new one. It's that simple. Get the Best Clean In order to maintain cleaning