This video was taken on Wednesday August 5, 2009. The location is Mason Street between Bay Street and Francisco Street in San Francisco. It was the day before street cleaning. Street cleaning is on the first and third Wednesday on that block although it apparently didn't happen that day.
There is a Trader Joe's on the same block. Trader Joe's provides paper carryout bags, not plastic. Paper bags are very much a part of the litter stream in San Francisco.