"Great Light Weight Bag" - Review of Marmot Atom Sleeping Bag: 40 Degree Down

I've been using Marmot sleeping bags for a decade, and they are well made and last. This sleeping bag is light weight (only a pound!), stuffs small, and is very comfortable. I bought it because my older 15-20 degree bag was always too warm for most of my camping, and I wanted to reduce the weight some. I used this bag several times in the mountains in late spring where the temperature ranged in the low 30's to upper 20's. Though the bag is only rated to 40F, with a silk sleeping bag liner, and wearing silk weight thermal underwear, I was able to sleep well. I was a little cold but I think that was due to the new sleeping pad I was trying out that was bought more for comfort (it didn't have an insulating rating because I suspect it doesn't really insulate). For all my summer trips where the temperatures been in the 40's or hotter, I've never been cold (even with that bad pad). I also haven't been too hot either which was always the problem with my older 3 season bags.
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