I made a pretty nice one from a pattern I found in a book on DIY backpacking equipment. I can't find the name of the book, but if you like I can scan the instructions in and send them to you. I made mine out of 1.1 silicon nylon. I made it extra large (10' x 6' I think) and use it as my tarp as well. I put some velcro tabs to hold up the extra when I use it as a poncho.
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