Dude why would you want a fucking messenger bag over a backpack?  Backpacks are sooo much nicer and more practical.  My backpack broke and I sent it in for warranty to get a new one, in the week I had to wait for my new backpack I had to use a messenger bag and it was fucking horrible.  If you skate or are in a hurry fucking messenger backs flop against your ass and it's sooo annoying, they just flop around everywhere it's so impractical.  Since then everyone I see with a messenger bag I think looks like a dipshit idiot, because they use it just for the looks when backpacks are a million times better.