Western Mountaineering Bison GWS -40F Degree Down Sleeping Bag

$1,150.00 - $1,190.00
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The Alaska Range is nowhere to make a bad gear choice. The Western Mountaineering Bison GWS, with its 10 inches of heat trapping loft and Gore Windstopper shell, is what it takes to stay warm at the 14,000 ft. camp on Denali. Nearly impervious to the elements, while remaining lightweight, the Western Mountaineering's Bison remains the most sought-after expedition quality sleeping bag.

  • Gore Windstopper shell reduces the threat of condensation and moisture while remaining breathable
  • A slightly over-sized winter fit ensures comfort when extreme weather necessitates an extra layer or two
  • The massive Reverse Differential Hood with an added external hood ruff seals in warmth
  • A full 3-dimensional down filled collar full provides a protective seal from the bellows effect as you move about inside your bag
  • Enjoy easy ventilation with a full-length #5 YKK Coil Zipper featuring two locking slider pulls for convenient access from inside or outside the bag
  • Dacron® stiffening tape ensures smooth zipping and prevents zipper jams
  • Robust double insulated draft tubes are offset and interlocking to ensure heat can't find it's way out through the zipper
  • 10'' Loft provides luxurious warmth and compressibility
  • 5'' spaced baffles allow maximum loft while preventing down migration
  • V side block baffles ensure that insulation stays put and increases the number of down filled chambers to warm quicker
  • DWR finish keeps moisture at bay even after multiple washings
  • Stuff sack and large volume storage sack included
  • Abrasion-resistant taffeta lines the inner foot box, allowing you to store gear or wear liners without compromising durability
  • Proudly made in the USA
Western Mountaineering Bison GWS
 Size 6'0" 6'6"
Temperature Rating -40 F -40 F
Insulation 850+ Goose Down 850+ Goose Down
Loft 10.5" 10.5"

Inside Girth

Shoulder/Hip/Foot (in)

64" / 55" / 39" 64" /55" / 39"
Fill Weight 42 oz. 45 oz.
Total Weight 4 lb. 10 oz. 4 lb. 13 oz.

Stuff Size (in)

11" x 22" 11" x 22"

*All measurements are in inches