Marmot CWM MemBrain Sleeping Bag (-40 Degrees Celsius)


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.

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SKU: 785562858749 Categories: , ,


  • 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


  • Bag Temperature Fahrenheit: -40° F
  • Bag Temperature Celcius: -40° C
  • Product Weight: 4lbs 15.5oz (2260g)
  • 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: 9.5 x 19in | 24 x 48cm
  • Includes Storage Sack: No
  • Includes Compression Stuff Sack: No
  • Compressed Volume: 1208.3ci » 19.8 liters
  • Stash Pocket: false
  • Pack Volume: 1208.3ci » 19.8 liters
  • Style Number: 22560


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