I have a 10 year old Rigid wet/drp vac that works pretty well. The problem is it's big, and noisy. The local hardware has a cute 5 gal shop vac brand, that's supposed to be quieter, at least the box says. The other thing thast confuses mme is there are filter bags, filter canisters, filter foam thingies, etc. What are all those for? Rigid has cartridges with particulate size rating down to HEPA supposedly, that I can understand. So I want: - Smaller size wet/dry vac - quieter - more portable. - standard filters / tools Thanks.