This bag goes down to how many degrees negative F?
Hi there. I added a bunch of info from Amazon. Look at the 2nd paragraph.
-40 if you use the SLEEP SYSTEM (clothing). I have two of these. Been using them for years (boy scouts). I’ve been outside, in tents, when it’s been -5 with just wool socks, undies and fleece hat. Was very snug. I’d put a Mylar blanket under the bag between you and the sleeping pad. I’ve been out in the 20’s during snow with only the bag system. Snowed on it wit some freezing rain. Was dry. Though I got one new ($200 and one used, $80) they both seemed BRAND NEW and the 80 bag even had a new bivy cover. That was like back 10+ years ago so you won’t find them that cheap unless you get lucky on eBay. Do yourself a favor if you get one, get another compression bag. And do not store them compressed. I keep mine in loose in trash bags. When I’m ready to use them, I stuff them in the bag and squeeze them down. Thats why they are way old and still loft well. These thanks are battle tested so you won’t find a 4 season bag system cheaper.