Miele 10123230 AirClean 3D Efficiency Dust Bag, Type U, 4 Count, 2 Air Filters 100% Randomly Spun Fibers Imported 3D efficiency allows dust bag to use entire volume Eco-Efficiency allows the vacuum to have maximum efficiently at low settings 99.9% Of all dust captured Soft Structure allows air to pass through smoothly Auto closure Air Clean color coded collar