The Macpac Epic 150 SF sleeping bag has a lightweight Pertex Endurance shell and is fully seam taped. It is functionally a bivy sack and sleeping bag combined. I did some controlled experiments, and also tested it stargazing in a damp meadow and sleeping under a minimal poncho-tarp on a stormy night. So, how waterproof is it?
Will Rietveld Ph.D, Senior Editor for Gear and Apparel, joined the BPL staff in April 2004. In his former career, Will was a research scientist, project manager, and R&D program administrator. Now retired, he lives in southern Colorado where he takes up a new career of backpacking year-round in the mountains and canyon country of the Southwest. During the summer months Will and his wife Janet are volunteer wilderness rangers in the Weminuche Wilderness. He has been a lightweight backpacker for 52 years and an ultralight backpacker for 13 years.
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