Got this bag a few weeks ago and decided to try out it's warmth by camping out in the back yard on a 25�F night. This bag is very light and would be great for backpacking. However, I found the draft flap to be inadequate. I don't know if it's drafty due to it's lightweight design or if the bag I received just had a flaw, but I had a hard time getting the flap to stay put. I also found the drawstring on the hood to be difficult to cinch down. Both of these items made it difficult to take full advantage of the 850-loft down, so given the price of this bag I decided to return it and go with the Marmot Pinnacle instead.