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sleeping bag system advice

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a few years ago my life was transformed when I we did the AT. I realized the value of ultra light backpacking! this has influenced me in boating and back country outings. I usually do one or two extreme trips a winter where I will go up to around 12,000 to 13,000 feet and camp when it is below freezing using a bivy sack. (i try to find some shelter in rock outcrops or snow to add to the protection.

so here is my dilemma. not wanting to take too much weight, yet not freeze my ***** off.

I am trying to find out if there is any research on temp ratings for doubling up sleeping bags. I am trying to find a lighter weight system.

I have been using a zero degree bag for a while in a bivy sack, but was wondering if doubling up on two 35 degree bags would do better. ( last time I did this it was -20 with out windchill. froze my butt off but no harm was done to any other appendages)

what are your thoughts. I am really, really limited on finances. so buying new gear is kinda our of the question. (because if i could i would want to buy a Arc Expedition quilt)

so thanks for any feedback!
also i am trying to make a light weight sil tepee tent for added protection any recommendations on that would also be great!
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· GoBro
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1,519 Posts
I think layer up on bags is bad, I think it has to do with how the bags insulate, but I'm far from an expert. There are sleeves which pack down to the size of a poncho which claim to add about 10degrees of warmth to your bag. I think you can double up on those. They come in silk and a synthetic. Reasonably priced, that may be your best option.
 

· GoBro
Joined
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1,519 Posts
(Anyone who subscribes to the theory that less clothing in the bag is warmer is WRONG - please refer to the lawas of thermodynamics before commenting on this. It's bullshit propaganda put out by sleeping bag companies!)
Obviously insulating warm layers are good, but I was under the understanding that shells just add bulk and disallow warmth from being reflected back to you from the bag. You tell me, I've never been so cold that I would try. I can't imagine a comfortable way for me to fit my shells inside my mummies either.
 
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