Make your own Sleeping Bag Technology -70F to +50F
admin July 27, 2007

Peter Hutchinson Designs has some of the most sophisticated arctic and high elevation sleeping bags in the world. Way overkill for any long distance trails here in the US, but check out their documentation and science behind the material usage and overall design. Check out PHD’s collection of technical documents including: What is Down?, Down vs Synthetic Insulation, and more…
They have developed an awesome software application built in into their website . A quick search on eBay for their products results in 0 results for both the .com and .co.uk (company is based in England).
http://www.phdesigns.co.uk/index.php
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