These dust filter bags have an extra filter chamber that pre-filters the dirt and dust being sucked in, ensuring better dust distribution within the bag. As a result, the maximum suction power of your vacuum cleaner is maintained until the bag is full and does not decrease as it does with conventional dust bags. Additionally, the outer walls of the bags are equipped with an anti-allergen filter layer. This effectively traps problematic fine dust that can trigger allergic reactions, such as pollen, mold spores, and dust mite droppings, securely inside the bag. Each AirSpace dust filter bag features a well-designed closure mechanism that keeps everything contained and never stirs up dust again.