Roger Lockewrote a review of Marmot CWM Sleeping Bag: -40 Degree Down on November 26, 2016
Familiarity: I've used it several times
This is one amazing sleeping bag, it's relatively light weight for as warm as it will keep you. The military equivalent, the (extreme cold weather bag) is almost twice as heavy and will soak water with the cotton canvas exterior.
This bag breathes as well so no worries about sweating. There is also no toxic, noxious smell to the exterior fabric like so many others have that are made outside of the U.S.
Buy it, you won't regret it!