Temperature Rating a HUGE disappointment...
I don't recommend this bag as it is advertised. It now sits in the trunk of my vehicle as an emergency sleeping bag along with the dual core sleeping bag I had purchased with it, as a 0 degree sleeping system. I used the tall version, as I am 6' 3" 195 lbs with an athletic body. It has plenty of room but in no way is this bag rated to 0 degrees. I spent a night in the Holy Cross Wilderness and temps got a s low as the low 20's throughout the night. How do I know? I was up most of the night cold and miserable checking my watch.
In addition the inside of the bag coupled with the BA dual core pad was like a slip n slide all night. Any slight angle and you had to constantly adjust yourself as you would slide to one side of the bag. It was a good concept by BA but it needs more thought. I'm tempted to drive up to Steamboat and dump this on their doorstep.
Don't waste your money on this one, unless you plan on using for car camping in 20 degree weather or higher.
I'm going back to MontBell down fill and a separate pad and sleeping bag system. Sorry Big Agnes. I wanted it to work, I really did... :(