Here's my tarp in action.
Mountain Laurel Design - catenary curve with the foot down into the wind and the head wide open. (It's so nice.) I think in this picture we were on a sand bar in a creek area. It was nice to bed down, but messy on that sil nylon.

MLD Tarp

(someone tell me if this picture posts correctly or not)
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I always forget and make it more complicated than it needs to be...it's just walking.