We've been using various STM bags for years now. They're superbly built, have tons of compartments and pockets, and just the right amount of tech style. STM's latest, the Evolution backpack ($100-$110), is no different. We've had one for about a week now, and it has already put all of our other backpacks to shame. The Evolution has a concealed waterproof laptop section, a built-in stow-away raincover, tons of pockets and organizers, a removable iPod pouch, and super comfortable straps. It comes in two sizes — small to fit laptops up to 13.3 inches and medium to fit laptops up to 15 inches.