This is a full on zero degree winter sleeping bag. It’s $789 online, so closer to $850 depending on the sales tax where you live. I’m selling it for $649 including shipping within the continental US. The bag was purchased in January 2022 and used 4 times, so it’s like new. Stored lofted in the gear room.

https://featheredfriends.com/collections/winter-expedition-sleeping-bags/products/snowbunting-es-0-degree-down-sleeping-bag