This is a Sierra Designs Mobile Mummy 15, Long. It is the new version released Fall 2021. 800 Fill DriDown. Weighs 42.33oz on my scale. So about a 6-7oz penalty over the lightest 15 degree/Long bags available, but you gain a lot of comfort and versatility for that! I’m 6’4″, 280lbs with broad shoulders and have struggled for years to find a comfortable sleep system. Most bags are too restrictive and quilts too drafty. Mobile Mummy’s are the second most comfortable option I’ve tried, after my VERY oversized Nunatak quilt. I love being able to sleep with my arms outside these bags, and wear them around camp in the spring/fall instead of packing a puffy. New condition, never used. Includes the stuff sack and storage bag. Made the mistake of purchasing this from Europe last December, when they were out of stock in the US. Paid $379.51. Current retail is $342.90 for the Long version +tax. Sell for $199 shipped. Paypal goods/services to confirmed addresses only.