Sierra Designs BTU-5 Sleeping Bag: Down Review
(Ryan Heffernan)

Sierra Designs BTU-5 Sleeping Bag: Down Review

Sierra Designs BTU-5 Sleeping Bag: Down Review

Not that you’d need it, with SIERRA DESIGNS’ BTU -5 SLEEPING BAG—an 800-fill down heat factory with one of the best heat-sealing hoods we’ve ever tested and a waterproof-breathable fabric.

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