S2S for me too. Sometimes just the pack cover...but if there's a chance i will not make it back to spike camp (unexpectedly stuck in the woods overnight) I take the poncho tarp. Converts into a decent shelter. Small pkg and weight penalty.
I called Jim at Jimmy Tarps and he had exactly what I wanted. It came in and I thought it was way too big...but I was way too wrong. I can shed my pack and completely tuck in the hip belt and all straps for water protection. Jim is a hunter first and foremost and his pack cover is built with that in mind.