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So light, it's tough to believe it's this warm.

Ever tried to knit yourself a sleeping bag out of live geese? It's hard―the geese won't sit still, and they really don't like it when you try to stuff them into a little sack. If you want life to be a little warmer, lighter, and more comfortable, the Marmot Lithium 0-Degree Down Sleeping Bag is a far better option than live geese, since it's filled with pure 850-fill goose down and has a DWR-treated Pertex Microlight shell that's as light, durable, and packable as they come.

Rated comfortable down to 18 degrees and manageable to 0, the Lithium is perfect for all but the chilliest winter nights, and still weighs a mind-boggling 2lb 12oz, making it Marmot's second-lightest 0-degree bag, after the Plasma 0. It seals you in snugger than a hibernating bear, with a down-filled collar and draft tube, and even uses a six-baffle hood and face muff to keep cold air from sneaking in around your head. There are stretchy baffles around the feet and head, too, for added comfort, and a trapezoidal footbox that's wider in the toes and narrower in the heels to match the shape of your feet.

  • 18-degree EN comfort rating
  • 850-fill down with Down Defender water-resistant treatment
  • Mummy bag with sewn-through baffles
  • Pertex Microlight nylon ripstop fabric with DWR treatment
  • Ultralight
  • Six-baffle Nautilus drawcord hood with insulated collar and draft tube
  • Trapezoidal footbox construction
  • Stretch tricot baffles at head and foot
  • Stuff and storage sack included

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Here's what others have to say...


good for 7000m peaks

  • Familiarity:I've used it several times

Used it on Pik Lenin. Warm and quick drying.



  • Familiarity:I've put it through the wringer

I love this sleeping bag! From remote glaciers in AK where outside of the tent the temps were -20 to -30 to high altitude camping in Ecuador I've had it everywhere and it's always kept me warm.

Natethor, could you please tell me where did you go in Ecuador exactly? Cotopaxi? Did you have to use a liner to keep you warm?

I'm considering this sleeping bag seriously, my other option is TNF Inferno -20, but it is much heavier. Any recommendation? I'm argentinian so I'm looking forward to use it in the Aconcagua next year.



    Just got the bag. It feels great. I have not used it outside but it has the quality I would expect from Marmot. Backcountry was great and as always very helpful.



    • Familiarity:I've used it several times

    This bag kept me very warm below 15 degrees F for 3 nights in the Shining Rock Wilderness area. It is light, packs down well, and kept me dry and warm in very humid conditions (camping near a river). I would recommend to anyone.

    Compression Sack

    Compression Sack

    Here is the long version in the Sea to Summit Event compression dry sack (item STS000220)

    what Volume Sea to Summit Event compression dry sack?

    Also curious what size sea to summit compression sack you used.

    Storage Sack

    Storage Sack

    here is the long version in the storage sack it comes in


    Lofty all-night bear hug? Yes please

    • Gender:Male
    • Familiarity:I've used it once or twice and have initial impressions

    This is the first warm down bag I have owned and it is awesome!! its so light, so lofty and so warm!

    I was super impressed by the feel of the new Pertex shell material. it feels really light yet remarkable burly like it will take a lot of abuse and be a good protector of the valuable down inside. when I saw how big the bag lofts out too I thought it would be tough to get it into the stuff sack it comes with but its actually very easy and you could get it way smaller with a compression sack. Its super light, which is cool because winter camping requires a lot of gear that adds up.

    I am 6'6" and 170 pounds and the long is plenty long for me to get in there and get a good seal with the hood around my face.

    I just had this up on Mount Whitney and it was too warm for me, I had to unzip a bit, and there was plenty of room for a couple Nalgene bottles and my ski boot liners in there with me!

    The only thing I am bummed about is that the draft collar does not have any sort of closure on the zipper side, which is silly. Marmot should know better. so i will be installing a snap on the draft collar on the zipper side so I can tighten it around my neck and get a good closure.

    other than that I am nothing but stoked with the bag, its really comfy, the nylon inside feels good on your skin, and the bag fits my body well, its like a big lofty bear hug all night long, who wouldn't want that?


    I have now used the bag multiple times and in some very wet conditions. and I could not be more stoked on it!! the shell does a great job at keeping water out, and even with lots of beaded water on the outer shell I the down stayed dry and lofty. even getting packed away like this for a day it came out of the stuff sack and lofted right back out, the down never got wet! truly amazing