What are some top of the line makes of silpoly/silnylon tarps? Lookin for some rectangles with grommets to slip in my backpack. Got some last year but hate the shape thought they were going to be square.

I seen a recommendation on here a while ago about a poncho geared toward hunting but cant remember the make, said it was expensive but top of the line. Anybody know some really good makes that make a tough poncho?