Advance filtration bags feature a hypoallergenic filtering system to reduce the amount of allergens being dispersed into the air. Easy-to-install design allows fast， simple replacement to minimize your time spent on maintenance. Disposable material allows you to conveniently discard filled bags for fast， easy replacement. Filtration bags are designed for use with compatible Oreck commercial upright vacuums ((U2000， XL2100 Series， and XL9000， U2000R-1， U2000RB-1， XL2100RHS - all sold separately).