But seriously, if this becomes a reality in many wilderness areas, as I believe it will, it seems the safest way of carrying multiple days worth will be some sort of ultralight crap tube, styled like those used in rock climbing. Crap on a paper, wrap it up, into the tube it goes. Preferably something with a screw top, good o-rings, and that can be lashed to the outside of a pack.
Does that mean we'll start seeing waste disposal stations at trailheads? The trash cans at Whitney Portal have to be pretty foul after a busy weekend.