Ideal for place where you can not hook up a shop vac , though it really do not help all that much with the mess the saw make . my 4000-09 saw blow sawdust everywhere , it seem about 50 % actually get to the exhaust port , regardless of what type of material I be cut . the bag catch some of it , but not a lot . the biggest drawback to the bag be its length . it might seem great for hold lot of dust before need to be empty , but it be so long it get catch in the wheel of the Bosch gravity rise stand . it can be leave on if it be rotate 180 degree at the dust port , but if you forget to flip it back over it will not catch any dust at all .