Thanks Jhaura,
I used the ground sheet for at least two reasons. I have an investment $$ in the Cuben Fiber and wanted the ground cloth for the added protection. It also helps keep my sleeping pad clean. If I had needed the weight of the ground cloth to stay below the 32 ounce (Sub 2 pound) weight I would have given it up. The down side is that on a slight slope the bivy would slide a little. This was not a big problem and I learned to be more careful to get my sleeping spot level.