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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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· Beginner
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Sleeping bag liners work and are much lighter than a second bag. Do you own a zero degree bag? I'm not sure why you would want to carry two sleeping bags, unless you already have them and can't spend any money, which I can totally relate to. If you own a zero bag you should consider wearing fleece pants and a down jacket when you sleep inside the bag. (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!)

If you are looking for a quality sleeping bag, I work for GoLite and we have two sales in Denver right now, selling 2010 bags at almost half price. We can put you in a zero degree, 800 fill down bag that's under four pounds for under $300... Feel free to PM me for details.
 

· Beginner
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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.
When you wear clothing inside the bag you keep more heat from ever escaping your body - even in a tight mummy bag there is usually some air space that steals heat from you.

I know people that design sleeping bags for a couple of major manufacturers and they both subscribe to the "heat reflects back" theory. I just don't get it. More layers will equal more warmth. Think of the down jacket as just more sleeping bag. Less heat leaves your body and your body stays warmer. I have tested this on consecutive 0 degree nights in a quincy and reported much more warmth with my clothing on.

It's funny how gear geeks perpetuate these rumors founded in bad science. :)
 
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