Ideal for allergy sufferers, this set of two HEPA vacuum-cleaner bags effectively traps 99.97-percent of dust and pollens down to .3 microns. Because over-filled vacuum bags lead to reduced suction, vacuum-cleaner manufacturers recommend changing bags as needed in order to maintain optimal performance. Designed for easy installation, the bags offer mess-free changing without unseemly puffs of dust and debris. For use with a Hoover UH30010COM canister vacuum cleaner, the set of two vacuum bags measures approximately 4 by 2-4/5 by 9-3/5 inches.