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Marmot Atom Sleeping Bag: 40 Degree Down description One single pound is how much the incredible Marmot Atom 40-Degree Down Sleeping Bag weighs. How did Marmot brings this sleeping bag's weight down to 16oz (regular)? They started off with high-loft 850+ fill down and covered the insulation with an ultralight LightForce nylon shell. An ideal choice for warm-weather summer camping trips or bike tours, the Marmot Atom Sleeping Bag is so light that you won't even notice it in your pack. |
Accurate temp rating in lightweight bag
lyn.greenh2291221: 
I also purchased this bag for 3-season backpacking and I'm very pleased with the product. I have used it 6 times at different morning temperatures and the 40 degree rating is about right - if you're in a tent. I sleep reasonably warm, and when the temp was below 40 I got cold. Above 40, in a tent, I have been fine. Above 50 you will be unzipping it. I don't sleep in anything except a polypro shirt and underwear, liner socks, and a wool beanie, so if you add a layer of thermal underwear, you can decrease the minimum temp.As SpriteMV says, the bag compresses very well. I can stuff it in the bottom compartment of my pack and still have room for my tent, footprint, and camp shoes. Try that with any other bag!The zipper is a bit on the small side, certainly not a #10, so be careful when using it. There is a draw-string hood which works well.Overall, if you want to shave a couple of pounds from your basic gear set for 3-season camping, the Atom is certainly the ticket.
Conservative Temperature Rating
quickstep:
I used the Atom so far just on summer hikes. Last weekend I trusted the weather forecast too much (low: 43F). At 6am it was 30F, and I was wearing long johns, a jacket, and a balaclava and was really toasty in the bag. I belong to the guys who easily freeze. It's the first time I experience a bag getting to a lower temperature than it is rated. I get my Atom, 4-season Therm-a-rest and all my clothes for three days in the lower compartment of my backpack. This sleeping bag is pricy but certainly worth the money.
Just what I needed
unchartedterritories2275090:
Kept my pack down to forty-five pounds on a climbing trip into the Sierras this summer with the help of this lightweight, but warm bag. I was skeptical at first as it seemed so small and thin, but temps dropped down into the thirties several nights and I was plenty toasty in this well-made bag.
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