FREE SHIPPING, Vacuum cleaner bags are made of a special synthetic fabric Spunbond-Meltblown-Spunbond (SMS). They have very good filtration and are exceptionally strong. The SMS bag clogs much harder and thus achieves up to 50% longer "life time" comparing to paper bag. The fine pores of the SMS materials retains the smallest particles (pollen, allergens etc.) but at the same time ensure high air flow and maximum suction power of the vacuum cleaner. The SMS bag adapts itself in the vacuum cleaner thus allowing optimal use of the volume.