I was going to get a picture of some white-trash bags but the pictures Google came up with were mostly NSFW (not too bad, but not something I wanted to leave on my screen).
Anyway, we use the plastic bags we get from the cash registers.
I have large office-sized waste baskets, which is just an old habit. I have one small waste basket and I have to empty that thing every few days. I use the Walmart grocery bags for that.
I would scan everything, but I would spend the entire day on my feet, trying to get it done, and that would never work. My printer/scanner/copier is at eye-level to me when I’m sitting at my desk.
But yes, except for a few things that I have to keep the originals for, everything else could be scanned, ideally.