Zurk you are correct that landfills would be mined. For the plastic bottles if nothing else. Joerg, there is a huge difference between SHTF and 10 or 20 years after SHTF. Long term, of course your correct. But bowstrings were made from sinew for thousands and thousands of years before modern materials were invented. Then of course we are back fighting to keep those strings dry and useable. But they are certainly doable. Also strings made from flax, nettle, and other natural products will be useable. They won't be as good, or take as much load as modern fibers, but they will work.