Marmot Atom 40/4 Long Sleeping Bag

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Item #: 332013620

The Marmot Atom’s ultra-light design and Marmot’s highest quality down have given it cult status among alpinists as a bivvy bag on extreme climbs, but its comfortable, silky fabric make it a great bag for warm-weather bivvies on casual summer road trips as well. Updated with our Down Defender treatment offering an extra level of moisture protection for sleeping bags exposed to wet environments.


  • Filled and Finished in Rohnert Park, California
  • Certified 850+ Fill Power Goose Down
  • Down Defender to Improve Water-Resistance in Wet Conditions
  • EN Tested
  • Pertex© Microlight® Shell and Lining Fabric
  • Sewn-Through Baffles
  • Nautilus 6-Baffle Hood
  • Classic Trapezoidal Foot Box
  • Hood Draw Cord
  • Full Length Zipper
  • Insulated Draft Tube
  • Stretch Tricot Baffles at Hood and Foot Box


  • Weight: 1 lb 8.5 oz (690 g)
  • Temperature: 40° F / 4° C
  • EN Rating – Comfort: 44.1°F / 6.7°C
  • EN Rating - Lower Limit: 35.4°F / 1.9°C
  • Fill Weight: 10.5 oz (300 g)
  • Inside Length: 87" (221 cm)
  • Shoulder Girth: 63" (160 cm)
  • Hip Girth: 58" (147 cm)
  • Foot Girth: 41" (104 cm)
  • Stuff Sack: 6" D x 12" L (15.24 x 30.48 cm)

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