If your summer bike tour is going to take you through different climates then the UltraLite is a good 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.​
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Details​:
Breathable, ultra-light, packable, and high-thread-count ExtremeLite shell fabric encases the insulation without adding unnecessary weight
Packs 16 ounces of ultra-premium, 850-fill down insulation to retain your body’s warmth and maintain a super-high warmth-to-weight ratio
Interlocking draft tubes and a down-filled collar prevent energy-sucking drafts from zapping your slumber
Slightly narrower shoulder girth helps eliminate pockets of dead air for improved warmth retention
Western Mountaineering bags are made in the USA
Specs:
Material - [shell] ExtremeLite, [lining] nylon taffeta
Insulation - 850+ fill down
Shape - mummy
Max User Height - (short) 5 ft 6 in, (regular) 6 ft, (long) 6 ft 6 in
Shoulder Circumference - (short) 59 in, (regular) 59 in, (long) 60 in
Hip Circumference - (short) 51 in, (regular) 51 in, (long) 52 in
1 lb. 13oz. total weight