The Summerlite 32 Degree Sleeping Bag is the lightest bag Western Mountaineering makes in a continuous baffle construction. The goal in designing this bag was to make it as light as possible without eliminating key features or function. The result is a fully-baffled bag that weighs only 19 ounces and features a full-length zipper with insulated draft protection! The SummerLite is a dream come true for lightweight backpacking fanatics.