I don't do the main shopping for my household but I have certainly brought food home on the bus at times, and I see it all the time. Those of you who don't see it probably just aren't riding the bus. In my middle class neighbourhood you also see an occasional person shopping with a wire or nylon "bundle buggy" - basically a two wheeled cart with a handle, similar to a wheeled suitcase. One time I was at the discount grocery store and a staff from my office was there with her girlfriend and they had come by bus for a bulk run and were debating whether to bus or cab it home. I would have offered a ride home but I was on foot myself.