Collapsible Bridge

A collapsible bridge is a system of canvas, pipes and cables that folds into a small trunk. When opened, the bridge has a canvas surface 5 feet wide and anywhere between 10 and 30 feet in length. In its shortest form (10 feet long) the bridge can support up to 600 pounds. For each additional 10 feet the bridge is extended, its maximum load decreases by 200 pounds, to a minimum of 200 pounds at 30 feet in length. Rings on the far ends of the bridge poles and on the trunk allow the bridge to be spiked in place in both ends.