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CWM -40° Sleeping Bag

4.7 out of 5 Customer Rating
CWM -40° Sleeping Bag is rated 4.7 out of 5 by 47.
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Out of Stock

CWM -40° Sleeping Bag

4.7 out of 5 Customer Rating
CWM -40° Sleeping Bag is rated 4.7 out of 5 by 47.
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Sale Price $409.99 Strikethrough List Price $819.00
Afterpay
Final Sale: may not be returned or exchanged
Final Sale

This item cannot be exchanged or returned. Valid while supplies last. All sales final.

This item is currently not available
Sale Price $409.99 Strikethrough List Price $819.00
Afterpay
Final Sale: may not be returned or exchanged
Final Sale

This item cannot be exchanged or returned. Valid while supplies last. All sales final.

This item is currently not available

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Product Details

Features
    • Filled and Finished in Rohnert Park, CA with Certified 800 Fill Power Goose Down
    • Pertex® Shield Waterproof/Breathable Fabric
    • Marmot Cross Baffle Construction Prevents Down Shifting and Colds Spots
    • 11-Baffle and Wrap-Around Foot Box Increases Warmth
    • Reinforced Foot Box Lining
    • Nautilus 6-Baffle Hood
    • "Feely" Draw Cords
    • Down-Filled Draft Tube
    • Ground-Level Side Seams
    • Hidden Draft Tube Pocket
    • Stretch Tricot Baffles
    • Velcro®-free Down-filled Collar
    • Zipper Guards
    • Stuff and Storage Sack Included
Description
Designed to deliver restful sleep in the harshest alpine environments, the CWM -40° Sleeping Bag takes the guesswork out of unpredictable weather during your overnight adventures. The waterproof and breathable Pertex® Shield fabric membrane offers protection from Mother Nature’s mood swings, while lofty 800-fill-power-down insulation keeps you warm in plunging temps. When it’s time to call it a day, give your feet a break in the 11-baffle wrap-around footbox with reinforced lining. Stretch tricot cross-baffle construction controls down shifting and eliminates cold spots. The down-filled draft tube and collar, nautilus 6-baffle hood, and zipper guards limit heat loss in the most extreme conditions.
Specifications
  • Bag Temperature Fahrenheit: -40°F
  • Bag Temperature Celcius: -40°C
  • Product Weight: 4 lbs 15.5 oz, 2260 g
  • Main Fabric: Pertex Shield 30d 100% Nylon 2 Layer R/S 2.3 oz/yd
  • Lining Fabric: Pertex Microlight 30d 100% Nylon RS 1.3oz/yd
  • Insulation Type: Down
  • Insulation Material: 800+ Fill Power Goose Down
  • Zipper Location: LZ, RZ
  • Shoulder Girth: 63in (160cm)
  • Hip Girth: 61in (155cm)
  • Footbox Size: 45in (114.3cm)
  • Includes Stuff Sack: Yes
  • Stuff Sack Size: 9 x 19 in, 24 x 48 cm
  • Includes Storage Sack: No
  • Includes Compression Stuff Sack: No
  • Compressed Volume: 1208.3ci » 19.8 liters
  • Stash Pocket: No
  • Style Number: 22560
Rated 5 out of 5 by from Himalaya Proven Just got back from a month climbing Pumori in the himalayas. This bag was the only thing that kept me sane and warm when it got to -15 degrees every night. Big enough to store a load of clothes, hot water bottle and inner boots in it every night, as well as me. Everything else in the tents froze overnight, especially at high camps, except this. Worked fine down to -20, and it appeared to provide better insulation than other big mountain down bags I used above 18,000ft, including some standard bags being used in high camps on Everest this year. Got to be one of a few products out there that can actually handle what it says it can.
Date published: 2019-05-03
Rated 5 out of 5 by from I used this sleeping bag on I used this sleeping bag on Denali this year during the early climbing season. With 25 days on the mountain and frequent -30F temperatures this bag kept we warm. My tent mate commented multiple times on how comfortable my bag looked. I can verify that this bag was comfortable from not only a warmth standpoint but also the size. I was able to keep my boot liners, camera batteries, and 2 water bottles inside the bag while maintaining enough space to toss and turn throughout the night. How many other mummy bags can provide that?
Date published: 2013-08-15
Rated 5 out of 5 by from Not just for extreme expeditions I’ve had a CWM -40 bag for a long time. When I gave my bag to my son, I bought another of the exact same bag for me. It was originally meant as emergency gear for extreme winter races. We ended up also using it for camping since it was so nice to have a cold weather bag. I once camped in it for two months in the winter in Alaska. The zipper closure, head design, and little pocket are all great. Even though I’ve only used it to about -10 and it is a bit more than I need, as I’m sure it would be fine for much colder temperatures, I love having this bag!
Date published: 2022-01-18
Rated 5 out of 5 by from Warm and "packable" I bought this sleeping bag after a North Face -20 Inferno bag proved not warm enough on some trips to Alaska or western Yellowstone in the winter. My biggest complaint with my old bag, other than not being warm enough, was that if I was sweaty when I got into it, all of the down got wet, and it lost a lot of insulating properties. The material of this Marmot -40 degree bag is much more water resistant, feels more durable, and it's been overall just a warmer, more comfortable bag. It packs "small" for what it is - and I feel more confident with it (especially with dogs!) because the material seems of a nicer quality. The foot box is comfortable. I don't need a pillow with this bag because it's just so dang POOFY. I really love it. I gave my husband my old bag and he's stoked with it, but only because he hasn't tried this one yet. ;)
Date published: 2019-06-19
Rated 5 out of 5 by from Yeah, Baby. This bag replaced my 30+ year old Marmot Penguin, which I've had on 5 Alaska range trips, hundreds of Sierra and cascade trips, and lived in a Yurt near Truckee for a number of years using. I loved that bag, but its time was up. The new Cwm was a welcome addition to the sleeping bag fleet, and is every bit as warm as my now old beat to death penguin once was. I look forward to another 30 years of abusing this bag in cold, cold , windy places, while snoring like a lumber mill at 30 below.
Date published: 2016-10-26
Rated 5 out of 5 by from Warm and cozy Although this bag adds some extra weight to my pack, it allows me to rest assured that I will be warm and cozy after a long day of playing hard outside. I'm now using this bag for my second winter outdoors in northern Wisconsin and have not been disappointed. I accidentally dumped a liter of water INSIDE the sleeping bag lady week and it dried without compromising the down within three hours outside in the sunshine although it was soaked and below freezing.
Date published: 2019-10-30
Rated 5 out of 5 by from Marmot CWM sleeping bag review I have had this sleeping bag for over a month now and have tested it in 25F air temps so far. I have been very impressed with the heat this bag generates. I was warm within 2 minutes of entering the bag.  I found myself venting the bag as it would get too hot even though I was in underwear. The MemBrain material works extremely well, I did not notice any condensation on the bag's outer surface at any time. I also like that Marmot has tiny snap closures for the neck baffle. The zipper guard could be stiffer and wider as I do find the zippers will still snag on the full length draft tubes (Western Mountaineering does this right BTW). The bag lofts quickly once out of the stuff sack. The vertical baffles seem to do a great job and the foot box works well too. I like the hanging loops for drying/storing this sleeping bag, it is a nice touch by Marmot. Definitely recommended and a steal for the price I paid. Good job Marmot. 
Date published: 2013-11-16
Rated 5 out of 5 by from home away from home This bag is awesome, being from fairbanks AK it hits -30 to -40 quite a bit and i have never been cold or felt any kind of discomfort sleeping in a tent in the mountains at these temps. This is by far one of the best purchases i have made for winter camping.
Date published: 2016-12-10
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<!--begin-bvseo-questions--> <!--begin-questions--> <div id="bvseo-questionsSection"> <div class="bvseo-question-answer" data-questionid="5667215"> <h2 class="bvseo-question"> What size compression sack would you recommend for this bag? Thanks! </h2> <div class="bvseo-question-detail"> </div> <div class="bvseo-author">Asked by: Signal18</div> <div class="bvseo-answer" data-answerid="6205295"> Hi, the size of the compression sack you are looking for for the CWM -40&amp;deg; Sleeping Bag is size Large.&#13;&#10;&#13;&#10;Thank you&#13;&#10;Marmot Consumer Care Team <div class="bvseo-author">Answered by: Alicja</div> <div class="bvseo-pubdate">Date published: 2022-03-07</div> </div> </div> </div> <script type="text/javascript"> if (document.getElementById('bvseo-questionsSection')) { document.getElementById('bvseo-questionsSection').style.display = 'none'; } </script> <!--end-questions--> <ul id="BVSEO_meta" style="display:none!important"> <li data-bvseo="bvDateModified">y_2022, m_5, d_24, h_21CST</li> <li data-bvseo="ps">bvseo_bulk, prod_bvqa, vn_bulk_3.0.27</li> <li data-bvseo="cp">cp_1, bvpage1</li> <li data-bvseo="co">co_hasquestionsanswers, tq_1</li> <li data-bvseo="cf">loc_en_US, sid_SP_219911, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]</li> <li data-bvseo="diagnostics">clientName_marmot</li> </ul> <!--end-bvseo-questions--> <ul id="BVSEOSDK_meta" style="display: none !important;"> <li data-bvseo="sdk">bvseo_sdk, dw_cartridge, 18.2.0, p_sdk_3.2.0</li> <li data-bvseo="sp_mt">CLOUD, getContent, 0ms</li> <li data-bvseo="ct_st">questions, product</li> </ul>