street-shopping
Walking around on the street and picking up the discarded items, putting them into a bag and walking home with them.
I walked out of my apartment and up huntington avenue and saw a t-shirt discarded on the sidewalk. I went into a dunkin donuts asked for a bag, and then returned to the t-shirt, picked it up, put it in my plastic bag, and continued walking. I eventually brought it home. I was street-shopping.