I have a Shang Ra La 3 and 5 skin. I think of it as a tarp but it is a shelter. Sorry I should have been more specific.
I have a couple of Ponchos the Hennessy's XL and a very old 1970's military issue. I have been lugging the military poncho around since the 70's. The Hennessy I purchased the same time I bought the typhoon. The Hennessy Rain Poncho is very large. HH rain poncho is too large for me, however it makes a great tarp.