Double antibacterial design, highly efficient antibacterial effect, resists 99.99% specific bacteria and mould. The non-woven surface layer and the inner layer of meltblown fleece are both equipped with DuPont silver ions, which can easily filter large dust particles. At the same time, unpleasant odours caused by the growth of bacteria, mould, such as Escherichia coli, Staphylococcus aureus and mildew are inhibited. Added activated carbon components, effectively absorbs unpleasant odours. High tightness, no ash or dust leakage. Large capacity of 3L, the dust bags hold dirt for 2 months, be comfortable and breathe through.