I got this Marmot Mesh Bivy for next to nothing, and it here in Texas it is all I need for hot humid summer nights...well, there are other good things to have on summer nights..but I digress. :)
Anywho, the beak does extend out somewhat but that's what makes it work for me, but I am looking for tarp that will cover the beak and maybe give me room for my pack when I know its going to rain, which isn't often. Im looking for something that is adequate but not overkill. Its dimensions are 26 x 38 x 96"