Saw a strong recommendation for this bag on Seattlepi.
Ultra 20°
1 lb 3 oz. | 540.0 g
Rating: 20 deg F | -7 deg C
$225.00A premium 800-fill goose down, 20º sleep system that offers superior warmth, unmatched comfort and versatility for the ultra-lite purist. Waterproof Pertex® Endurance Arid Zones™ at the head and foot of the bag protect against condensation in critical areas. The comforter-style top can be attached directly to a sleep pad at variable girths for ideal temperature regulation.
Fill Weights: Small 257g; Medium 270g; Large 297g
Sleeping Bag Specs
* Rating: 20 deg F | -7 deg C
besthike.com 