Nader A.wrote a review of Sea To Summit Trek TkII Sleeping Bag: 18 Degree Down on January 4, 2015
Familiarity: I've put it through the wringer
It compresses small, it's very warm, it's roomy, you can open the hood to allow for more air if it's too hot in the bag. The footbox can unzip if you are too warm. The whole thing can be a blanket. It's an excellent bag and I've slept in it down to 9 degrees. There are also loops for hooking it on to a sleeping pad so you don't roll off.