When the lake turns black, sneak into your tent and tuck yourself into the Big Agnes Blue Lake Sleeping Bag. Rated to 25 degrees Fahrenheit, the Blue Lake feels right in most conditions from spring to fall. Its synthetic insulation stays warm when wet, and keeps you nice and toasty in moist environments. A semi mummy shape allows room for shifting and turning yet keeps the bag compact for camping convenience. Big Agnes designed this bag with a unique cordlock that lets you un cinch the hood in warmer weather, There are internal loops for liners, and external loops for hanging the bag out to air. The Blue lake also features a mesh storage sack and a nylon stuff sack.