M Sierra Designs Vapor 15 Sleeping Bag Review
by Will Rietveld
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For the shoulder seasons and for some winter camping situations, many hikers prefer to use a sleeping bag with a temperature rating of 10-20 F (-12 to -7 C). Others may prefer a warmer bag like this for summer backpacking in the mountains, simply to ensure they don't get cold. While the latter group could benefit from our lightweight philosophy, as explained for sleeping bags in our article: Ultralight Three-Season Down Mummy-Style Sleeping Bags: State of the Market Report 2010, both groups can save weight by carrying an ultralight sleeping bag.
Sierra Designs claims their Vapor 15 is the lightest 15 degree down mummy-style sleeping bag on the market (we will check that out in this review). The Vapor 15 sets another landmark for Sierra Designs - their first bag featuring 850 fill power down - rivaling bags from Marmot, Feathered Friends, and Western Mountaineering. What is there to like and dislike about the new Vapor 15, and how does it stack up, by the numbers, to comparable bags?
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