Was lucky enough to draw ds102 TMA !! And have most of my gear assembled and purchased but am looking for some heads up on what bivy sack to consider. Preferable on the less expensive side of this as I am a bit over budget already!! Looking for lightweight and totally waterproof... obviously(rather be wet from inside than outside I guess. I have no experience with bivy sacks but need have to the ability to sack out nearly anywhere!!.