However your winter season takes shape-backpacking in the Eastern Sierras, car camping in Yosemite or bunkering down in the Buttermilks-the down-insulated Bishop Pass -15F packs versatility and performance in one. Lighter for longer backpacking trips without losing out on chilly comforts, a full GORE-TEX Windstopper shell makes this bag windproof and virtually waterproof while remaining surprisingly compressible. Camp comfortably without worry of spilled coffee, morning condensation, or unshielded skies because, whatever you encounter, it holds up against the unpredictable.