One of my favorite books is Steven Caney's "Play"
https://www.amazon.com/Steven-Caneys-Playbook-Caney/dp/09111...
From an older edition, one of many projects was making a hammock out of old 6-pack rings. For many years, the plastic used in these rings is designed to degrade, but at the time the book was written it would have worked.
http://3.bp.blogspot.com/_Zkz9la3e96c/SmyCb2oFfvI/AAAAAAAABt...
