The Western Mountaineering Kodiak GWS is a four-season winter bag with a manufacturer-rated limit of -18°C. It's filled with 850 g of 850+ fill power goose down certified under the Responsible Down Standard (RDS), for a total weight of 1415 g — a solid ratio for a bag built around genuinely freezing conditions.
The Gore Windstopper (Gore Infinium) shell adds a windproof, moisture-resistant membrane, which matters most on exposed sites where wind causes more heat loss than direct snowfall. Continuous baffles, an insulated draft collar, and a draft tube along the zipper limit heat loss at the usual weak points, though the bag can't be zipped to a matching partner to form a double.
Packed to 46 × 23 cm, it's on the bulkier side for a winter bag — better suited to supported treks or trips where pack weight isn't the limiting factor. Sized for users up to 182 cm, unisex fit.
Specifications
Color
Green
Limit Temperature
-18 °C
Temperature Rating Standard
Manufacturer rated
Season Rating
4-season (winter)
Total Weight
1415 g (3.12 lb)
Fill Weight
850 g (1.87 lb)
Shoulder Width
168 cm (5.5 ft)
Foot Box Width
104 cm (3.4 ft)
Packed Size ( Length x Diameter )
46 x 23 (1.5 x 9.1 ft)
Insulation Type
Goose down
Fill Power
850
Shape
Mummy
Baffle Construction
Continuous baffle
Baffle Orientation
Horizontal
Zipper Side
Left
Shell Fabric
Gore Windstopper (Gore Infinium)
Water Resistance
Waterproof/breathable membrane
Draft Collar
✓
Draft Tube
✓
Stuff Sack Included
✓
Storage Sack Included
✓
Size Category
Regular
Maximum User Height
182 cm (6.0 ft)
Gender-Specific Fit
Unisex
RDS Certified Down
✓
Warmth-to-Weight Ratio f(x)
12.7 °C/kg
Fill Efficiency f(x)
2.12 °C/100g
Weight per Degree f(x)
78.6 g/°C
Bag Type
Mummy sleeping bag
Where to buy
No offers available for this product yet.
Category context Sleeping Bags (417 products)
Weight
Standard weight· mainstream zone 819–1420 g· ranked 310 of 418