Today, there are hundreds of models of vacuum cleaner envelopes or vacuum cleaner bags from different brands in the market, the smallest size of which is 5 and the largest size is 125 cm. In fact, when buying a vacuum cleaner, you should know that there are different types of envelopes, including: There are one layer, two layers, three layers and four layers, sometimes a micro filter is added to them, which is placed inside the vacuum cleaner and will prevent dust from entering the motor, and it is worth mentioning that there is no need to buy a micro filter. When you don’t have a vacuum cleaner bag, it can be said that you will need a micro filter for every four vacuum cleaner bags you buy.