the canvas bags that everyone will be using and plopping down on the conveyor belt at the grocery store, will have all kinds of micro-organisms on them. I doubt people will ever clean the inside or OUTSIDE of these bags. These will then, in turn, spread disease... imagine putting your lettuce (which can sometimes peak over the plastic bag it’s in) on top of that same conveyor belt.
Ew, I didn’t think of those issues.