Originally Posted by
The Big Lebowski
I would be more tempted to simply add this to a double layer, or directly under your bag. There will be no problems if there's a strong breeze going. I did look at these some time ago as a dedicated winter solution, but weight and bulk ruled it out for me.
A friend simply uses a summer back with reflective foam padding added inside it and directly below his winter bag with great effect.
Cost- About £20 and good for -7 (20f) and probably a bit more.
If you don't go far from your travel source, they make a great/cheap alternative. They are well made for the price.
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