Anyone can get tyvek free at the US post office. They use it for Priority mail envelopes. Turn it inside out.



You can use plain white tyvek as the replacement for biots on prince nymphs or color it for nymph wing cases.

http://www.rr-tu.org/Monthly_Fly.html

http://hopperjuan.blogspot.com/2010/...-nymph-20.html

You can also make stuff sacks with these bags.

http://www.youtube.com/watch?v=IyYuET-UOEk