Nanga is a Japanese brand and NML is their research arm. Their new Level 8 sleeping bag is part of the High-End Model Series.
They’ve moved the zipper closer to the center of the bag to get it higher up off the ground and incorporated dual draft tubes. The individual baffles are each filled with different amounts of Ultra Dry Down, depending on where they are located in the bag, with vertical baffles along the backside.
These are serious bags for serious conditions. Look for two models with one going all the way down to -23 deg C.