It fits size 13 shoes and a change of clothes! It fits 30 beers! It shows off your bomb-ass taste in cheap beer! (yes, while some may be confused, 30-racks are sold in the southeast United States). It fits ramen, caffeine, cds, books, a macbook, whatever you need. With it's unique space-saving integrated handle design, chicks will totally dig it. Know what I'm sayin, bro?
As longs as dudes are going out and getting one of these guys a week, why not recycle with some duct tape, cardboard, and a box-opener.
P.S. I considered a shoulder-strap as an afterthought. I just wanted to avoid the schweaty back induced by traditional backpacks.