Kelton, I've performed extensive bag testing
And here's some of the results:
How much do you pay for your paper bags? I normally get a six pack of Kirby HEPA bags (various versions) for around $12 on eBay. Then I had an idea: turn them inside out and blow them out with a Kirby. And guess what? It works perfectly and I was able to blow them out up to 8 times.
And to all those claiming that the pores clog on HEPA bags, you're dead wrong!
Typical airflow loss (typical house dust, carpet, dog hair) from a FULL Kirby bag is around 11%. So you would still have 89% airflow still available using a HEPA bag when it's full.
After you blow it out (I've made several videos showing this), the bag will give you about 94% of new bag airflow with no change in filtration capability (yes, I have a particle meter).
Bill (VacLab on YouTube)