it's Tarptent Aeon Li.
A couple of years ago on a early season elk hunt, I was sitting above a spring (the only water probably in 3-ish square miles); I made camp on a small ledge (steep enough on the one side, I slide a log next to me so I wouldn't inadvertently go over the edge)- tent wouldn't have worked in that spot, the bivy was just right though. I was able to glass until nightfall, get up in the dark and eat breakfast able to watch the spring laying in my bag/bivy. Of course the forecast was very favorable for that trip; bad weather in a bivy is really bad
