FlyFishNutwrote a review of Big Agnes Storm King Sleeping Bag: 0 Degree Down on February 3, 2016
Familiarity: I've used it once or twice and have initial impressions
Upgraded to this bag from an old down bag that was still awesome, but too heavy and too constricting around my shoulders. I researched and settled on this bag for its temp rating, size and weight.
The StormKing is a solid well rounded bag at at great price point.
Headed out into the snowy NC mountains for a trip to test her out. The temps were in the upper teens with a couple inches of snow on the ground.
I used the same set up I always use in cold temps: An old school original Thermarest on top of a foam Ridgerest.
The first night I was surprised how roomy the bag was - really addressed my claustrophobic issues. I slept like a baby, which is unusual for the first night out (a flask may have helped). I didn't get cold, but I was comparing to my old bag where I was TOASTY even in sub-zero temps.
I attribute the lack of total cozy warmth I'm used to with my old bag to the larger size of this bag - more area to heat.
The following night was in another area, less snowy and 24 degrees. This time I used my Cocoon Coolmax liner and put my puffy into the bag to take up space and voila! Total warmth to the point I had to vent the bag a little during the night.
So I slept like a baby again (the flask was drained the 1st night so that wasn't a factor, unfortunately).
Overall happy with the warmth, weight and super roomies of this bag. I will just have to stuff some clothes in it to take up space that might try and leech some body heat.
Also the sleeve for the sleeping bag contributed to my great slumber -not having to reposition my bag or fight slipping off the pad was a nice benefit.