Western Mountaineering HotSac VBL
Price Paid: $55
A very useful 6 oz. to extend temperature rating of Western Mtneering Antelope MF by maybe 10F. I really like how it keeps the down much, much drier, as it's a total pain in the fedunza to dry a bag in the winter.
It probably could also double as a lightweight bivuoac sack. Really like the VBL concept, hope soon to try a Warmlite triple bag.
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Here's what other sites are saying:
The HotSac vapor barrier liner from Western Mountaineering is an important companion for those technical winter trips.