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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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· Kayak/SUP Instructor
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You might try adding an Army poncho liner to your bag. I've spent a zillion nights under the stars in Alaska with an extreme cold weather bag and a poncho liner. Gets too cold you can throw in a hand warmer.

I have the Wiggy's FTRSS made in Grand Junction. It's a two bag system. Give them a call and they'll tell you everything you need to know about two bag systems. Especially if you speak to Wiggy himself
 

· Kayak/SUP Instructor
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1,339 Posts
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.
Modularity allows flexibility through all seasons. Why carry more bag than nessesarry or less bag than required?
 

· Kayak/SUP Instructor
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Sparky

The poncho liner is essentially a quilted rectangular bag liner that is much more versatile. Combined with a poncho it makes a great ultra light summer sleep system. I'd say stick a poncho liner in your zero degree bag and try it out. I'll bet you gain 10 more degrees with it.
 
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