The Atom’s ultra light design and high quality down have given it cult status among alpinists as a bivvy bag on extreme climbs. A great bag for warm-weather nights on casual summer road trips, the full update — with changes like curved baffles that reduce shifting down and a fold-down second zipper for ventilation — makes this bag even more comfortable than before.



  • Fold-Down Second Zipper Provides added Ventilation, Easy Access. Anti-Snag Slider reduces Snagging
  • Anatomically Designed Footbox with Wrap-Around Construction increases Warmth
  • Smooth-Curved Baffles Reduce Down Shifting. Nautilus Multi-Baffle Hood limits heat loss
  • Filled and Finished in Rohnert Park, California
  • Certified 800+ Fill Power Goose Down
  • Ultralight Pertex Microlight 20d 100% Nylon Ripstop DWR 1.03 oz/sqyd
  • Sewn-Through Baffles
  • EN Tested
  • Full Length Locking YKK Two Way Zipper with Zip-Guard Slider
  • Down Defender to Improve Water-Resistance in Wet Conditions
  • Internal Stash Pocket
  • Snagless Insulated Draft Tube
  • Two Way Zipper Sliders
  • Hood Draw Cord
  • Zipper Garage
  • Stretch Tricot Baffles
  • Two Hang Loops
  • Stuff and Storage Sack Included

Main Materials

Pertex 20d 100% Nylon R/S 1.03oz/yd

Lining Material

30d 100% Nylon DWR 1.09 oz/yd

Insulation Material

800+ Fill Power Goose Down

Fill Weight

8.6oz (245g)

Bag Loft


Bag Temperature F

40° F

Bag Temperature C

4° C

EN Rating

Comfort: 44.1°F / 6.7°C | Lower Limit: 35.4°F / 1.9°C | Extreme: 8.4°F / -13.1°C

Interior Length

81in (206cm)

Bag Dimensions (Shoulder x Hip x Foot)

61in (154.9cm) x 56in (142.2cm) x 39in (99.1cm)


1lbs 4.7oz (589g)

Collections: multivariant, multivariant_fb

Category: Down, Sleeping Bag

Type: Camping

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