This vacuum bag replace the OEM red cloth "shake out" bag and uses an advance inner liner (SMS). The additional liner provides greater filtration helping to eliminate the puff of dust that occurs with a standard cloth bag. Each bag includes the spring and closure clip. For use without the paper F&G inner bag. Designed specifically for commercial use, they are always equal to, or exceed OEM quality. Better filtration means cleaner air, less dusting, longer secondary filter life, at considerable savings. Maintains suction longer than conventional bags: better suction, less vacuuming. Keeps machines running at peak performance. Removes many indoor allergens, especially in the critical 0.3 to 1 micron range.