DESC: Weighing at 3lb 3oz, the rectangular Big Agnes Storm King sleeping bag provides a lightweight and roomy solution for catching some Z's at zero degrees. To keep things light, Big Agnes filled the top baffles with supremely-toasty 650-fill goose and eliminated insulation on the underside of the bag. Instead the underside of the bag (where down would get compressed, lose its loft, and therefore its warmth) accepts a rectangular sleeping pad using a built-in sleeve so you never roll off your cushioning at night. Big Agnes finished off this frigid-weather bag with a water-resistant shell treatment and draft-blocking designs at the zipper and collar so the cold won't creep in while you slumber.