I love my Briggs and Riley backpack [/url=http://www.briggs-riley.com/businesscases/nonrolling/280_deluxecomputerbackpack.asp]link[/url]
Like all B&R stuff it is pricey, but very well designed and like all B&R stuff has the magic warranty (I've never had to use it for the backpack, but I suspect they are sorry I ever bought the Roll-aboard

).