I have a tigoat raven omni in excellent condition for sale.  I purchased this bivy in 2012, so I am not sure which fabrics were used at the time.  Manufacturer lists at 8 oz, but it is 9.3 oz on my scale after painting the entire bathtub floor with silicon.  The silicon will keep you put.  Bivy has approximately 10 nights use.

Thanks for looking. Alex