These dust filter bags feature an extra filter chamber that pre-filters the dirt and dust being sucked in, ensuring better dust distribution within the bag. This helps maintain the highest suction power of your vacuum cleaner until the bag is full, preventing a drop in performance like 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 has a well-designed closure mechanism that contains everything and never stirs up dust again.