U.S. Patent No. 4,387,927 (.pdf)
The next time you need classy, waterproof outdoor seating just grab the nearest trash can and some metal shears. Well, maybe not all that classy, but given some embellishment it could be! This patent's directions are quite direct and to the point; everything is covered from what size can to use, what to cut and where, and how to keep the whole shebang together and padded for extra comfort. Perfect for a back-alley bistro.