The use of a paper towel, purposeful throw-away middle layer, is cited by multiple sources. It's not the greatest thing in the world, but it's generally readily available, adds one more layer to help disrupt exhaled droplets. This isn't for all day use, but to do a focused trip to a store to pick up necessary items, then toss the towel and clean the cloth mask after returning home, should be workable.
I'd be leery of vacuum bags/filters, have to be careful about knowing what a given item is made of:
"And for those of you inclined to add a vacuum HEPA filter to your DIY mask, Nasseri advises against it.
"Be really cautious, because especially the ones in vacuum cleaners and vacuum bags, are chemically treated on the outside, so as you breathe through, you're going to get specific chemicals," Nasseri said. "And those are chemicals you don't want to be breathing up against your face for several hours. So please, don't do that." "