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I'm trekking up the Kilimanjaro and planned on using my sleeping bag which is rated for -10 / +10 with an extreme at -17 degree Celsius. I read that temperatures may plunge down to -25° at the very top, although I don't know how cold nights at the camps are to be.

I was planning on making my own Vapor Barrier Liner in case I get cold, despite the bag and my cotton liner.

My plan is to use a heavy-duty garbage bag (to prevent moisture from leaving), add infrared radiation reflection with a thermal blanket inside of that, and to make things cozy, slip in my cotton liner.

Is this a decent homemade vapor barrier liner? If not, how can it be improved? Also, how damp may my cotton liner be in the morning with such a system?

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Could someone add the tags "vbl", "vapor" and "barrier" for ease of searching? I don't have enough reputation just yet. Thank you. – ChrisR Jan 3 '14 at 0:11
These tags would only be synonyms of vapor-barrier so shouldn't be added. – Liam Jan 3 '14 at 13:55
I assume it is a down sleeping bag? – ppl Jan 5 '14 at 18:31

I would consider a polyester or wool liner before one made of cotton. Cotton is quite comfortable dry but not so much wet. Andrew Skurka has a lot of experience with vapor barrier and wrote a good article about it.

How damp will it be is dependant on how well your thermoregulation is. I would definitely recommend trying your system before hitting the mountain.

For me, vapor barriers are interesting on long, multi-months, trips. Just make sure that if you get cold on top of the mountain you don't end up cold and wet with your vapor barrier!

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