Ok, I decided to give the BBO a try. Paul had one gray "lefty" BBO, so since I have a "lefty" WBBB (zipper on the right) I ordered it and it's on it's way to me. I'm hoping the gray color will be light enough to overcome any claustrophobic issues. We shall see. If it's not my cup of tea, I'm sure I can find it a good home.
I have a MacCat deluxe tarp, and I have a 12x15 OES cat cut tarp on order. I thought that I could use the larger tarp in cold weather & close off the ends, but this tarp's primary use will be as our river kitchen tarp. I didn't want to count on using it for extra warmth on early spring or fall trips..... hence the BBO.