If you live in San Francisco you'll at least see four of the same type of messenger bag a day. Brands like Timbuk2 and Chrome must be making good sales at the moment because i think almost everyone in SF own one of them! Whether you're a biker or a business man you'll see all types of people with these bags all around San Francisco. Ok, ok I own one too so I can't be too harsh. The chrome bags are so comfortable and easy to take of and on when on Muni as well. They're also good for my school books and laptop too, so I can side with all of those who own one.
(Courtesy of Flickr.com)