Mike Z.wrote a review of Marmot CWM Sleeping Bag: -40 Degree Down on January 29, 2019
I bought this bag 3 years ago with Backcountry, I have used it 3 years in a row in the BWCA for winter camping. I sleep in a normal winter tent, not a hot tent. This past weekend we went winter camping in the BWCA and the forecast was a high of -3 F and a low of -30 F. We camped for 3 nights, one of the nights got down to -46 F and I can truly say that I had zero problems staying warm the entire night. I wore 1 base layer of smart wool long underwear and a smart wool beanie stocking cap. I sleep in a MSR Fury tent(also purchased with Backcountry). I would highly recommend this bag to anyone looking to stay warm in any winter camping conditions.