For all of you MD central vacuum fans-they now have a new closed bag upgrade for Modern Day,Flow Master and Silentmaster MD vacuum machines.It has a new cloth outer bag-used with the new Tru-Seal 5 ply Filtrete disposable bag.It holds up to 8 gallons of dust and dirt-and the really unique thing about this bag is that it has three intake openings.Two for plumbed intakes and one for the utility intake.The utility intake opening on the bag locks onto the short feed horn.The other two require adding the extended bag horn.Easy to put in.I have saved this for future use-since my Silentmaster is freestanding-used only with the 35Ft hose and the utility inlet.These bags are GREAT-no messy replacing the large open top bags.This should appeal to folks who have allergies.The airflow is the same as with the open Hyperflow bag system.Just so much easier and less messy to empty the unit.If you don't use the other inlets on the bag-just leave the cap on them.The cap is captive to the bag-you close it when removing the bag from the machine.You could empty this in your Sunday best and not get dirty.This is worth the effort-takes only five min to do.The kit was $59.It has two disposable Tru-Seal bags,support outer cloth bag and one inlet horn.