Which bag is best for the Comfort Pro backpack vacuum?

There are three different paper filter bags for the Comfort Pro: there is a closed mouth bag that is HEPA; there is a closed mouth bag that is just high filtration; and there is an open mouth bag. The bag you use depends on the how much filtration you need and what you are vacuuming. The closed mouth HEPA bag is going to last a lot longer and will fill up alot more without losing vacuum power since it has so much surface area. The high-filtration bag is still very good at keeping particultaeout of the air, but not as good as the HEPA bag. Finally, the open mouth bag is awesome for picking up large debris in areas where you are filling the bag up quickly, such as construction sites. This bag has the ability to be dumped out 2-3 times and still be re-used