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drying sleeping bag in the sun.
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Apr 5, 2016
So noticed that many sleeping bags are dry on the inside to facilitate drying in the sun. Most of the time when a bag gets wet, the outside is the part that gets wet which makes me wonder why not make the outside black instead since turning the bag inside out requires the moisture to pass through the insolation. wisam
Joined Jan 18, 2012
55 points
Apr 5, 2016
Rock Climbing Photo: Best climbing pants EVER
The bigger concern is moisture generated by your body overnight. A typical adult male exudes about 1 liter of moisture over the course of a night of sleep - about 2/3 of that is through sweat (the rest is exhaled).

If you're getting your bag damp every single night from the inside, it makes sense to have the inside black, whereas exterior moisture is only a concern some of the time.
Jon H
From Boulder
Joined Nov 24, 2009
138 points
Apr 5, 2016
normal perspiration from the body will eventually end up in the outer layer ... which is why its almost never the inside of your bag which is wet in the morning (unless you screw up), but the outer part even if it doesnt touch any of the tent walls

the body heat will push the moisture outwards, but if the dew point is in the bag, it will condense and the down close to the outer shell will get damp

from a world leading researcher on cold weather effects ...

Rock Climbing Photo: Cold Weather Clothing  Gordon G. Giesbrecht, Ph.D....
Cold Weather Clothing
Gordon G. Giesbrecht, Ph.D.
Professor
Health Leisure and Human Performance Research Institute
Department of Anesthesia, Faculty of Medicine
University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
Presentation at the
Winter Wilderness Medicine Conference
Snow King Resort
Jackson Hole, Wyoming, Feb. 13-18, 2003


Rock Climbing Photo: Cold Weather Clothing  Gordon G. Giesbrecht, Ph.D....
Cold Weather Clothing
Gordon G. Giesbrecht, Ph.D.
Professor
Health Leisure and Human Performance Research Institute
Department of Anesthesia, Faculty of Medicine
University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
Presentation at the
Winter Wilderness Medicine Conference
Snow King Resort
Jackson Hole, Wyoming, Feb. 13-18, 2003


theres really no reason why the entire sleeping bag shouldnt be a dark colour other than there may be perhaps be a benefit if the bag gets blown away or you need visibility for rescue or for your team to keep track of you on the climb

or for those "cool technical" colours

theres several ways to reduce the dampness problems with sleeping bags ...

but thats another post

;)
bearbreeder
Joined Mar 1, 2009
3,068 points
Apr 6, 2016
agree on the moisture not condensing till reaching the outer layer which is why I'm wondering why the outside isn't black rather than the inside unless it's just a cosmetic thing. wisam
Joined Jan 18, 2012
55 points
Apr 6, 2016
its so that they can find you frozen body in the snow after its been devoured by polar bears ...

cottage manufacturers often make their bags/quilt in darker plainer colours

;)
bearbreeder
Joined Mar 1, 2009
3,068 points


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