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Bison GWS
Bison GWS
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See Explantion
  • 5 1/4" Spacing/V-Block Side Baffle
  • 64"/39" Shoulder/Foot Girth
  • Full Down Collar
  • Insulated External Hood Ruff
  • Offset Insulated Double Draft Tubes.
  • 10" Loft, -40° F
  • 42 oz. Down Fill
  • 4 lbs. 10 oz. Total Weight

Denali, Aconcagua, Himalaya...mountaineering in its extreme sense. These are places where mistakes cannot be made and so the Bison is most often chosen to serve. Gore Windstopper™ fabric makes this bag impervious to the elements while remaining lightweight and very compressible. Crammed with 42 ounces of 850+ fill power down this bag has 10 abundant inches of heat trapping loft. Huge V-Block Side Baffles and horizontal baffles across your chest keep the down fill in place. Double Interlocking Draft Tubes and a down filled Gore Windstopper™ collar seal in heat and security while howling winds surround your tent. The massive hood is not only well filled but is completely made with Gore Windstopper™ fabric and has a large integral hood ruff to seal your face from the elements. The Bison is the crowning glory of Western Mountaineering and demonstrates our commitment to innovation and quality. This life saving bundle weighs in at a scant 4 lb. 10 oz.

Model Shape Size
(ft/in)
Rating Loft
(in)
Inside Girth
shdr/hip/foot (in)
Fill Wt. Total Wt. Stuff size
(in)
Sac Size
Bison GWS Mummy 6'0" -40° F 10" 64"/55"/39" 42 oz 4 lb 10 oz 11 x 22 XXL
(w/ full collar)  6'6" -40° F 10" 64"/55"/39" 45 oz 4 lb 13 oz 11 x 22 XXL
Model Shape Size
(cm)
Rating Loft
(cm)
Inside Girth
shldr/hip/foot (cm)
Fill Wt. Total Wt. Stuff size
(cm)
Sac Size
Bison GWS Mummy 180 -40°C 25.5 163/140/99 1190 g 2095 g 28 x 55 XXL
  (w/ full collar) 200 -40°C 25.5 163/140/99 1275 g 2180 g 28 x 55 XXL


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Top photo Early 1900s © G. Schaezlein
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Western Mountaineering