I purchased the Tyvek tarp at E-Bay https://bestoutdooritems.com/backpacking-tarps/. It ran me like $24 delivered for the 9' x 10' Tyvek sheet, and included 10 corner loops. Our search and rescue team tried tyvek tarps. We ran them through a washer without soap first to make them more flexible but using them in the rain every crease made by softening them leaked no matter how sloped we made the shelter. So our experience showed tyvek to not be a good candidate for shelter unless it's virgin , never folded, smooth product.


Edited by Axel999 (04/24/18 01:16 PM)
Edit Reason: link