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Last updated January 1st, 2020
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The Western Mountaineering Bison Gore Windstopper Sleeping Bag is a -40°F sleeping bag for mountaineering expeditions to the peaks you've always dreamed of. As the wind howls through the night and the snow is doing its thing up on the mountain, you can zip yourself inside this Bison for warm. Packed with 42oz of 850+ fill power goose down to create a 10" loft so you'll be sleeping soundly, dreaming of standing on the peak by sunrise. The GORE® WINDSTOPPER™ shell fabric provides the weather resistance you'll need in extreme weather and temperatures. Who would've thought all this warmth can weigh in at just 4lbs, 10oz? Made right in the good old US of A to make all of your cold weather dreams possible.
FEATURES of the Western Mountaineering Bison Gore Windstopper Sleeping Bag
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
Product Specifications
Stuff / Compression Sack Dimensions:
11 x 22 in.
Gender:
Mens
Features:
Draft Collar
Best Use:
Basecamp and Expedition, Winter Camping, Backpacking, Mountaineering and Alpine
Exact Temperature Rating:
-40 Degrees Fahrenheit
Sleeping Bag Shape:
Mummy
Bag Weight (Regular):
4 lbs 10 oz
Bag Weight (Long):
4 lbs 13 oz
Fill Details:
850+ Fill Down
Zipper Side:
Right
Fill Weight (Regular):
42 oz
Fill Weight (Long):
45 oz
Max User Height (Regular):
6 Feet
Max User Height (Long):
6 ft 6 in.
Foot Circumference (Regular):
39 in.
Foot Circumference (Long):
39 in.
Shoulder Circumference (Regular):
64 in.
Hip Circumference (Regular):
55 in.
Shoulder Circumference (Long):
64 in.
Hip Circumference (Long):
55 in.
Product Technology:
GORE Windstopper
Disclaimer:
We only ship this brand to US Addresses.
Insulation:
Down
Temperature Rating:
-50 - -1 Degrees Fahrenheit
GORE WINDSTOPPER
GORE WINDSTOPPER fabrics utilize an ultra-light, ultra-thin membrane to block wind while allowing interior moisture vapor to escape. This will keep your body and your inner layers dry and comfortable.
Product Reviews
Rated 5 out of
5 by
Mordloo from
WarmthnessI have had few sleeping bags over the years like the Cumulus 1400, Fjallraven Polar.. but nothing comes close to the WM Bison in terms of warmth and comfort level. The zippers are top notch, you dont really need to fiddle with it. Highly recommended!
Date published: 2019-10-21
Rated 5 out of
5 by
Wormkit from
COZY FIREPLACE-27℃ night @ camp2 ama dabalam nepal. feels like sleep in front of a cozy fireplace.hard to describe the detail, highly recommended.
Date published: 2014-12-03
Rated 5 out of
5 by
Jeff from
pretty awesome bagon an ill fated (we had to hike out to closest road after getting dumped on by 20" snow over night) Pemi traverse last winter this bag was awesome. I am 6'6" 185lb and always cold in bags in the winter. This is the first bag that I was legitimately warm in the middle of a northern NH winter.
Date published: 2011-11-05
Rated 4 out of
5 by
Luke from
Beautiful bag and backed by an awesome team of people at WMMy relationship with this bag can be best summarized as love at first sight. Unfortunately, the first time I used the bag I noticed that the stitching (though beautiful and perfect everywhere else on the bag) was loose in about a 1 cm section at the base of the collar, and it was slowly leaking down. I called WM and they were super nice and helpful. They told to mail in the bag on their dime (using their UPS account), and they would fix it and rush it back to me in time for a trip a month from now. I have never felt so good after dealing with a customer service department. I still have 100% confidence in the bag, and now I also have 100% confidence in the company and their warranty.
I'm a woman who's 5'2. With all honesty, would this be a good fit?
Asked by: nellyattar
Hey there, Nelly!
Great question! From your questions about our other sleeping bags, we see you're heading to Mt. Everest next year. I spoke with one of our gear guys who is also a mountain climber to get you an expert answer. He wanted to let you know that this bag would be ideal for that kind of expedition.
He said that length isn't as big of an issue as degree of warmth of the sleeping bag. He also said you're going to have a hard time finding a shorter bag than this one. In fact, if it's a little long for you, once you're zipped inside, you've got more warm air trapped in there with you, and you'll have some extra room to add layers of clothing if you need to.
The only other sleeping bag he would recommend for your needs is this one by Mountain Hardwear: https://bit.ly/2MRQyLM
I hope this helps!
Answered by: Buttercup
Date published: 2019-12-02
HI - can you please tell me what size this compresses down to? In liters? Or size sea to summit water proof compression bag?
Asked by: Theresa C
Hey Theresa C, thanks for the question! This bag has packed dimensions of 11" x 22", based on these measurements the XL Sea to Summit Compression Sack should work. I hope this helps!
Answered by: Marty Moose
Date published: 2019-11-06
I read somewhere several months ago that this bag can come in a little wider version. I would order the 6'6"bag. is there a width difference between the shorter bag? Im a bit of a wide guy:)
Asked by: Airlarry
Hey there,
Thanks for the question! For this bag, the 6'0" and 6'6" versions both have the same dimensions (Shoulder 64", Hip 55", Foot 39") with the only sizing difference being the length and the weight (the 6'6" is 3 oz heavier). The inner dimensions are not different between the two lengths. Hope this helps!
Answered by: Winklebottom
Date published: 2021-11-20
I want to buy this bag, but you don’t have a 6’6” in stock. Is there a way to work with moosejaw to get one in stock so I can do business with you instead of some other company?
Asked by: Alaskaman
Great question!
Unfortunately we and the folks over at the warehouse don't have an insight to when future products will be stocked but they receive new inventory every day so check back often!
Hope this helps!
