Hey everyone, one of my backpack vacuums, the powr-flite comfort pro premium can use either close or open mouth bags. The idea is that with the open mouth bags, you can dump them out and reuse them a few times. I would not do that, that has the same issues as bagless vacuums, you have dust all over the place and the fine dust will still clog the pores. I might consider the open bag for another reason though, does anyone know if these would offer better airflow than the closed mouth bags? If so, I may consider them, otherwise I will stick with the closed mouth bags.