The Granite Gear Pillowsack is a multipurpose sack. The Pillowsack offers the convenience of a stuff sack while offering the comfort of a pillow. Made of sil-nylon, the Pillowsack won't add on too many ounces. Thanks to a fleece covered side on the Pillowsack it will double as a soft pillow. Use the Granite Gear Pillowsack with something soft, like a down jacket, and settle in for some sweet dreams.