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  • Marmot - CWM Sleeping Bag: -40 Degree Down - Team Red/Redstone
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  • Marmot - CWM Sleeping Bag: -40 Degree Down - Team Red/Redstone

Marmot CWM Sleeping Bag: -40 Degree Down

sale from $639.16 $818.9520% Off

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    • Team Red/Redstone

    4 Reviews


    Engineered for the world's harshest environments.

    Get some shut-eye in the death zone with a little help from the Marmot CWM -40 Degree Down Sleeping Bag. This 800-fill goose-down-insulated bag is built for the coldest, harshest weather on the planet, from the South Col to the South Pole. Its waterproof, breathable Pertex Shield 2L laminate prevents rogue bits of water, tent condensation, and melted snow from clumping your down and ruining your sleep (and chances of summiting tomorrow). The outer fabric itself is made from rugged 30D nylon ripstop and the lining from 30D nylon ripstop Pertex Microlight, which has a soft feel and the durability to prevent feather leaks.

    Cross-baffle construction keeps down from migrating and the wrap-around footbox traps heat ultra efficiently and lets your feet sit comfortably. The CWM comes with a drawcord hood with easy-grab cords, a warm down-filled neck baffle, and zipper draft tube to seal up all the gaps against the unrelenting cold and make sure all your body heat stays close, where it belongs. The draft tube also sports a hidden pocket so you can access small gear without having to unzip in the middle of the night, and Marmot included both stuff and storage sacks so you can bring your bag along and make sure it stays lofty when you're off on more summery adventures.

    • Pertex Shield 2L waterproof and breathable membrane
    • 30D nylon ripstop outer fabric
    • Pertex Microlight 30D nylon ripstop lining
    • 800-fill goose down
    • Cross-baffle construction
    • Wrap-around footbox
    • Down-filled draft collar and draft tube with hidden pocket
    • Storage and stuff sacks
    • Drawcord hood
    • Item #MAR00IA

    Tech Specs

    Manufacturer Warranty
    Recommended Use
    alpine & expedition, winter camping, backpacking
    Claimed Weight
    [regular] 4 lb 10 oz, [long] 5 lb
    Stuff Size
    9.5 x 19 in
    Stuff Sack
    Storage Sack
    -40 F
    Fill Weight
    2 lb 12 oz
    1 internal
    Draft Tube
    Foot Circumference
    [regular] 3 ft 10 in, [long] 4 ft
    Hip Circumference
    [regular] 5 ft 4 in, [long] 5 ft 6 in
    Shoulder Circumference
    [regular], [long]
    Max User Height
    [regular] 6 ft, [long] 6 ft 6 in
    Pertex Shield membrane
    800-fill goose down
    [membrain/laminate] Pertex Shield (2-layer), [face fabric] 30D 100% nylon ripstop, [lining] Pertex Microlight (30D 100% nylon ripstop)

    Tech Specs

    • Reviews
    • Q & A

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    • 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!


    • Familiarity: I've used it several times

    Not much into to writing these, but do read them, ha. Not a hi-altitude climber but do play in the back country. Liked the idea of warm-no-matter-what, and comfortable sleep all around, willing to pack an extra lb of down. cwm delivers. Have spent a few nights on snow on neo-air pad under the stars, or falling snow a few times, had to vent the bag, no prob doing so. 3 day bkcountry snow camp in glacier last month, stellar. Had girlfriend along, left and right zipper cwm's, w bags zipped together to canoodle, exceptional comfort, again had to vent, no prob. both bags are longs, so gear went in her foot space, nice to have. made great sit-up eskimo wrap playing card game on snowy night as well. Inhales, lofts to advert 8-10" well, tho a little less so after a few dozen uses, expected. stuffs well in sack. color, workmanship is superior. will bcountry hike with these, kayak camp, snow camp, and have an excuse so may head to denali next month.

    add that zipper wants to snag so slow and steady. nice if it had cell ph pocket.

    closing comment, 20% off here is a steal in this bag category. Happy trails.

    Bomb proof

    • Familiarity: I've put it through the wringer

    Bought this last fall. It's seen plenty of use. The coldest I've tested it was -55F. And that was far north of the artic circle (north slope). I use it with my Exped downmat 9 LW and North face mountain 25 tent. It has never let me down. I got the 6'6 one so their is plenty of room for boot liners. I put my wet/frozen fask mask in the bag before bed and every morning it is warm and dry. This thing is incredible. Would not hesitate to purchase again if this thing ever kicked bucket. A product that I have and will continue to trust my life with.


      Just got my cwm bag. Nothing negative or positive to write about the bag yet, but ill add another review when I put this thing to good use. ill upload a picture of it compressed in a 20L sea to summit compression sack here soon.