Waterproof: Mammut Shield Sleeping Bag

It’s not at all counterintuitive and it’s not necessarily for rain. It’s move the condensing point of moisture closer to the shell of the bag. In cold, dry conditions the bag will stay drier and lighter longer. On North Pole expeditions the bags can gain 40-50 pounds of water weight, they gain substantially less with a Gore-Tex or Event laminate shell. If it were such a stupid idea than Mountain Hardwear and Feathered Friends wouldn’t make comparable bags.

The above link took me to wilderness sysytems kayak page. Oh this sleeping bag, I am SURE there will moisture and condensation INSIDE the bag with this setup, no Goretex or event fabric is THAT breathable. The vapor barrier needs to be BETWEEN the person and the insulation to work properly…to quote Lynn Weldon…who are you trying to kid?

If this bag is what the specs say — 2.5 pounds, 15 degrees, waterproof, breathable — it will be a godsend of a product for ultra-lighters. I would have loved to have had this setup on a few recent backpacking and mountaineering trips where I brought a bivy and a bag. They weighed more together and were no where near 15 degrees warm. Will try and get my hands on one soon for a test. . .

I’ll look forward to your review of this when you get to test it out.

I love mammut sleeping bags especially the one on outdoor gear.

Condensation inside the bag will be a problem, i checked with mammut and (steinar.martinsen @ ajungilak.no) confirmed that the inside is not vapour prof, so you have to use an inner Vapor Barrier Liner, to avoid getting the bag wet from the inside, also avoid breathing into the bag..

http://www.westernmountaineering.com/index.cfm?section=products&page=Accessories&ContentId=44