Not all dust bags are of the same material. Cloth, paper, and microfibre are a popular material for dust bags. In the case of disposable bags, the paper is the most common material. Paper is very convenient as a disposable bag. But good microfibre synthetic bags can improve the better cleaning performance for the vacuum cleaner. This is because it is possible to manipulate the material at the microscopic level to enable a better flow of air without compromising the ability of the bag to trap dust inside it. Then there are carbon PET bags that are meant for people with allergies.