Western Mountaineering Hot Sac VBL

Western Mountaineering Hot Sac VBL is rated 3.6667 out of 5 by 3.
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Product Description Item No.   10016934

The Western Mountaineering Hot Sac VBL is a sleeping bag liner to increase the warmth of your winter bag on the frostier winter trips. At just 4.5 ounces of weight, cold weather expeditions can hardly go without one of these puppies. It fits on the inside of your sleeping bag, up to 6'6" of length. The ripstop nylon face fabric plays nice against the inside of your bag, while the reflective metal coating on the inside stops heat loss from evaporative cooling. Whoa, science, I almost can't handle it.

FEATURES of the Western Mountaineering Hot Sac VBL

  • VBL works by stopping heat loss from evaporative cooling
  • Elastic draw cord at the top
  • Lightweight

- + Product Specifications
Material Details: 0.6 oz Ripstop Nylon
Disclaimer: We only ship this brand to US Addresses.
Weight: 4.5 oz
Gender: Unisex, Mens
Best Use: Winter Camping, Rescue and Emergency
Max User Height (Regular): 6 ft 6 in.

Sleeping Bags Size Comparison Charts

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Model Shape Size Shoulder Girth Hip Girth Foot Girth
MityLite Semi Rectangular 6' 3" 62" 59" 46"
HighLite Mummy Box Stitched 5' 6" 59" 51" 38"
6' 0" 59" 51" 38"
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SummerLite Mummy 5' 6" 59" 51" 38"
6' 0" 59" 51" 38"
6' 6" 60" 52" 38"
Tamarak Semi Rectangular 5' 0" n/a 58" 33"
MegaLite Mummy with Top Collar 5' 6" 63" 56" 39"
6' 0" 64" 55" 39"
6' 6" 65" 56" 39"
UltraLite Mummy with Full Collar 5' 6" 59" 51" 38"
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6' 6" 60" 52" 38"
AlpinLite Mummy with Full Collar 5' 6" 63" 56" 39"
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6' 6" 65" 56" 39"
VersaLite Mummy with Full Collar 5' 6" 62" 53" 39"
6' 0" 62" 53" 39"
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Microfiber Series Bags
Model Shape Size Shoulder Girth Hip Girth Foot Girth
Caribou MF Mummy Box Stitched 5' 6" 63" 56" 39"
6' 0" 64" 55" 39"
6' 6" 65" 56" 39"
Alder MF Semi Rectangular 6' 0" 62" 59" 46"
6' 6" 62" 59" 46"
Sycamore MF Semi Rectangular 6' 0" 62" 59" 46"
6' 6" 62" 59" 46"
Ponderosa MF Semi Rectangular 6' 0" 67" 64" 48"
6' 6" 67" 64" 48"
7' 0" 67" 64" 48"
Apache MF Mummy with Full Collar 5' 6" 59" 51" 38"
6' 0" 59" 51" 38"
6' 6" 60" 51" 38"
Badger MF Mummy with Full Collar 6' 0" 66" 57" 41"
6' 6" 67" 58" 41"
7' 0" 67" 58" 41"
Antelope MF Mummy with Full Collar 5' 6" 62" 53" 39"
6' 0" 62" 53" 39"
6' 6" 63" 54" 39"
Sequoia MF Semi Rectangular with Full Collar 6' 0" 66" 61" 48"
6' 6" 66" 61" 48"
Kodiak MF Mummy with Full Collar 6' 0" 66" 57" 41"
6' 6" 67" 58" 41"
7' 0" 67" 58" 41"
Bristlecone MF Semi Rectangular with Full Collar 6' 0" 69" 61" 48"
6' 6" 69" 61" 48"
Lynx MF Mummy with Full Collar 5' 6" 61" 54" 39"
6' 0" 62" 54" 39"
6' 6" 63" 55" 39"
Puma MF Mummy with Full Collar 5' 6" 62" 55" 39"
6' 0" 64" 56" 39"
6' 6" 66" 57" 39"
Gore Windstopper Series Bags
Model Shape Size Shoulder Girth Hip Girth Foot Girth
Apache GWS Mummy with Full Collar 5' 6" 59" 51" 38"
6' 0" 59" 51" 38"
6' 6" 60" 52" 38"
Badger GWS Mummy with Full Collar 6' 0" 66" 57" 41"
6' 6" 67" 58" 41"
7' 0" 67" 58" 41"
Antelope GWS Mummy with Full Collar 5' 6" 62" 53" 39"
6' 0" 62" 53" 39"
6' 6" 63" 54" 39"
Sequoia GWS Semi Rectangular with Full Collar 6' 0" 66" 61" 48"
6' 6" 66" 61" 48"
Kodiak GWS Mummy with Full Collar 6' 0" 66" 57" 41"
6' 6" 67" 58" 41"
7' 0" 67" 58" 41"
Lynx GWS Mummy with Full Collar 5' 6" 61" 54" 39"
6' 0" 62" 54" 39"
6' 6" 63" 55" 39"
Puma GWS Mummy with Full Collar 5' 6" 62" 55" 39"
6' 0" 64" 56" 39"
6' 6" 66" 57" 39"
Bison GWS Mummy with Full Collar 6' 0" 64" 55" 39"
6' 6" 64" 55" 39"
- +
Rated 5 out of 5 by from Roasty Toasty - Love it! Great product from a great company. Comfortable, quiet and highly reflective fabric keeps your bag dry and your "sac" warm. Highly recommend as a vapor barrier liner or an emergency bivy. ,,,,BUY IT!
Date published: 2013-12-22
Rated 4 out of 5 by from See what it's like, whatever you do. Great item if you want to burn up in sub-zero weather. Overkill for me with my Western Mountaineering Bristlecone -10 degree bag, but maybe I will change my mind during an exceptionally cold night, when my wife throws me out.
Date published: 2005-11-15
Rated 2 out of 5 by from Too narrow Used it for the first time last night and found it kind of confining and difficult to turn over in. Not sure about durability yet. But it did seem to keep me warming.
Date published: 2016-01-31
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Is this breathable

Asked by: Bobster
Hey Bobster, Thanks for the question. Breath-ability wasn't the characteristic that Western Mountaineering had in mind when creating its' HotSac VBL. A VBL works by stopping heat loss from evaporative cooling. The proprietary fabric doesn't allow water or air to pass through, making it ideal in extremely cold conditions where breath-ability would not be a priority.
Answered by: James
Date published: 2016-03-04
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