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Western Mountaineering Bison Gore WS Sleeping Bag ‑40C (Unisex)

$1065.00 - $1090.00 CAD

This item is only available as a special order. Please call 1.888.847.0770 for more information.

Western Mountaineering Bison Gore WS Sleeping Bag ‑40C (Unisex)

Product Number: 5002-383
Made in USA

Weight: 2.09kg (Regular Left Zip)

Named for a beast that survived ice ages, the bison is crammed with almost a kilo of heat-trapping down. Designed for Denali, Aconcagua, the Himalaya, or anywhere that mistakes could be really quite dire. Huge V-block side baffles and horizontal baffles across your chest hold the down in place. Double interlocking draft tubes and a filled collar seal in heat and security while frigid winds snuffle around the tent.

  • Shell, collar, and draft tube are GORE™ WINDSTOPPER® fabric, which is light, compressible, and impervious to the elements.
  • Deep hood is well filled, and has a large integral hood ruff to seal your face from the elements.
  • Offset, insulated double draft tubes ensure the down doesn't migrate and create cold spots.
  • #5 YKK locking zipper.
  • Note this is a special order item. Please call us for information.
Weight 2.09kg (Regular Left Zip)
Seasons Winter (-15°C to -40°C)
Shape Mummy
Insulation 850+ fill-power goose down
Temperature -40°C
Down Weight

The amount of down used to fill the product (given for the medium size).


The thickness or puffiness of a bag – a key factor in determing a bag's warmth.

Shoulder Girth 163cm
Hip Girth 140cm
Foot Girth 99cm
Length Regular fits to 6' 0" (183 cm)
Long fits to 6' 6" (198 cm)

An insulated collar that covers your throat and shoulders to reduce heat loss.


For Off-line Shopping call 1.888.847.0770 (Canada & USA), or 604.876.6221 (Vancouver & International)

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