What began as doodling on your Jansport, and progressed to an anarchy pin'd shoulder bag, must now become a more dignified, unique crap-caddy. For bespoke baggery, check out CallieCo.
Handcrafted in Brooklyn, CC's bags, pouches, and wallets are constructed using materials discarded by artists, thus achieving that which art could not, i.e., usefulness. Configure your sack using CC's sturdy, standby detritus (canvas, cotton, leather, etc), or request specific stock, from denim straps to zipper pulls made from Lego man heads (thus achieving that which the Danish could not, i.e., usefulness). No matter what materials you go with, you specify your pocket needs (iPod, power supply, etc), bag size (for tiny or backbreaking laptops), even shape (octagon!).
While CallieCo's bread and butter's custom work, they also stock a variety of staple designs -- in case you realize that, just like in grade school, all you really want to do is fit in.