Unquestionably one of, if not THE, best ultralight sleeping bag on the planet.
(See the myriad positive reviews from reputable individuals and organizations, such as outdoorgearlab.com)

ZPacks 10 degree, 900-fill down, size long, regular width.
The bag weighs half a pound less than the typical 'premium' sleeping bag of similar warmth. See ZPacks' website for detailed weight and fill specs.

Used only 4 nights total, this bag is in excellent condition. It's about as close to new as you can get. The fabrics are in perfect shape and the bag has only been compressed into a stuff sack ~5 times.

Paid $440
$350 here with free shipping to CONUS
transfer via PayPal or Venmo

If interested please write to: max dot neale at gmail dot com

I'll remove or modify this when the bag is no longer available.