Bumbakpaks hybrid messenger/backpack laptop bags were created by a consultant who suffered from three herniated discs as a result of carrying around heavy laptops. Combining dual shoulder straps with a rectangle shape, the "Urbanomic" (i.e. urban+ergonomic) bags reduce strain on your back and hang low on your "bum." Designed around the laptop, their revolutionary "bak2Pak" carrying system also evenly distributes weight to promote good posture and conveniently converts from dual strap (to be worn low on your back) to single strap (for slinging over the shoulder) or the strap can be removed entirely for briefcase-style transport. A top-loading pocket features a weatherproof zipper and adjustable padded inserts to keep your computer snug. The bags also have lots of well thought out details like newspaper/umbrella holder, mesh padded straps to keep you comfortable and dry, a pass-through for the handle on your wheelie luggage and plenty of pockets. The bags come in four sizes and various colors; the new pink design pictured is due out in October. Well-made and well-priced ($85-$95), they're available online from Bumbakpaks.