I finished up a bivy yesterday and got some pictures this morning.
Specs: Intrepid top. Very good feel to this material.
I put a 4.5 in bathtub floor on it. The zipper is somewhere between a half zip and quarter zip. Small taper on it that leaves enough room to fit a 20 square pad the full length.
I stuffed it with a comforter as I did not have anyone to get into it at the time.