Meet the SkySaver: a personal rescue backpack designed to facilitate safe exit from high-rise buildings in case of an emergency situation. It carries up to 300 lbs of load and allows escape from up to 260 feet. This automated controlled descent device is portable and attaches almost anywhere. Just put the backpack on, tighten the straps, clip the edge of the cable to the anchor point, and go down through any opening.
A device like this might save your life in case of a fire. The above video shows how the SkySaver rescue backpack works.