If your summer backpacking trip is taking you into the Sierra Nevada, or your bike tour is going to take you through different climates then the UltraLite is a great choice. With a 59″ shoulder girth this efficient bag is good to 20°. The full down collar helps to seal in heat around your neck without adding excess bulk, and 16 oz. of high lofting down pumps this bag to 5″. The total weight of this very compressible package is only 1 lb. 13 oz (6' length).
The 5' 6" length weighs 1 lb. 12 oz.
The 6' length weighs 1 lb. 13 oz.
The 6' 6" length weighs 1 lb. 15 oz.
Western Mountaineering rates the bag at 20°F, which is based on extensive field testing. The EN13537 "Comfort Rating" (a.k.a. "women's" or "cold sleeper") is 25°F, and the "Limit Rating" (a.k.a. "men's" or "warm sleeper") is 14°F.