While not an ultralight bag, this Eastern Mountain Sport Mountain Micro 40-degree bag is fine for the partner who backpacks occasionally.

Hooded mummy bag has 13 oz. goose down fill, with 60% on top, 40% on bottom.  I measure 3.5-4″ average loft.  Internal slant-wall baffles, no sewn-through construction.  2 lbs. 5 oz. total weight.  Full-length, 2-way, right-side zipper with draft tube.  Measures about 29″ by 79″; about 65″ to chin section of hood.  Small zippered storage pocket on top.  Included stuff sack weighs 3.5 oz. and has fleece lining for use as a pillow.

Bag is always stored loosely in a large storage bag.  Non-smoking household, no furry pets.  Bag is in “like new” condition.

Asking $90, including CONUS shipping.  Paypal F&F preferred; otherwise add 3%.