Perhaps the ulitmate in backpack/rucksack/lap top bag design, the Billykirk Rucksack is an extra sturdy carryall that will tote your laptop, a change of clothes, some provisions, and have enough space left over to accommodate even more goodies.
But that's not all. Made of super tough waxed cotton canvas and using Horween vegetable tanned leather for its leather straps, the bag is weather proof as well. Its also lined in nylon for easy cleaning and padded for extra comfort.
As if that weren't enough, its hand-made in the U.S.A. and guaranteed to last a damn long time. We've got two left and their days are surely numbered...