There is a geocaching term “CITO”, which means Cache In Trash Out. You bring a bag with you and carry out trash you find while geocaching. For a few years I’ve been doing something similar when walking.
Walk Around, Trash Out. Not as catchy as the original but it will do for now.
[I started doing this when walking the greyhound, and later the dobie. I don’t mind picking up trash (it’s rather satisfying to see a clean expanse of grass) but I am older and also have pain from a vertebral compression fracture from my army days. So I don’t stoop anymore, I use a Nifty Nabber.
I think the whole thing is a muscle memory from both scouting and the military where one has to police one’s Area of Operation (AO).