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Atom 40° F Sleeping Bag (Long)

In Stock  Product Number: 12759

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The Atom's ultra-light design and our 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.


  • 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
  • Velcro-free Face Muff
  • Zipper Garage
  • Stuff and Storage Sack Included
  • Zipper Guards
  • Fill: 850+ Fill Power Goose Down
  • Temperature: 40� F / 4� C
  • EN Testing Norm: 43.2�F / 6.2�C Limit
  • Bag Weight: 1lbs 8oz (680g)
  • Fill Weight: 10oz (283g)
  • Loft: 4
  • 89in (226cm)
  • 63in (160cm)
  • Hip: 59in (150cm)
  • Foot: 41in (104cm)
  • Stuff Sack: 6 x 12in
  • 15.24 x 30.48cm

Gender: Unisex
Material: 20 Denier 100% Nylon Ripstop DWR
Season: F14 S15
Vendor ProductId: 22410
Review ProductId: 11807


by PowerReviews
MarmotAtom 40° F Sleeping Bag

(based on 1 review)

Ratings Distribution

  • 5 Stars



  • 4 Stars



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  • 1 Stars



Reviewed by 1 customer

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Atom Bag

By Chris the Backpacker

from Chattanooga, TN

About Me Avid Adventurer

Verified Reviewer


  • Adjustable Hood
  • Comfortable
  • Lightweight
  • Stows Easily
  • Warm


  • Compression Sack Needed

Best Uses

  • Backpacking

Comments about Marmot Atom 40° F Sleeping Bag:

Marmot sleeping bags are the best you can buy. It may cost a lot of money but it is well worth it. If you add a compression sack to the jumble than you can get it to compress even smaller. The temperature rating for me personally was a little on the low side but maybe thats because I sleep very cold.

  • What Is Your Gear Style:
  • Minimalist

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