Filter Bag Seal -D1505 (3 Pack) SKU: D1503 $22.49 Made of HEPA material that filters down to 99.97% of dust down to 0.3 micornsHEPA Filter Replacement Bags for the D1505 BackPack Vac2.5 Gallon sealable cover, keeps particles contained for safe disposalHEPA filer bag disposal seal for EPA RRP and hazardous materialClean filter without opening canister by wiggling the agitator rodAlso comes in a 10 pk (D1504)