ALPS Mountaineering - Crescent Lake 0-Degree Sleeping Bag

I’ve spent weeks tent camping on a cold Arizona mountain mine site in the middle of February. I’ve spent days and days “snow camping” in Connecticut forests. I was perfectly comfortable because I always had a bag that was overrated for the conditions. It is well known that a bag rated for 0-degrees will keep you in survival range at 0-degrees for 6 hrs if you are optimizing all key aspects… staying off the ground (sleeping pad, multiple layers of cardboard, branches, or tons of dry leaves), under cover (tent or lean to), kept dry (you in your dry clothes, in a dry bag), and out of the wind (tent, or some sort of natural or artificial windbreak). Break with one aspect and you could get yourself in trouble. I always get a bag rated 10-20 degrees under what the worst weather expectation is or if I have experienced knowledge of the area’s conditions during at given time of year. If the weather report says 10 to 20 degrees at night… I bring my 0-degree bag. If the weather focast says 0-degrees… I bring my -20 bag… and so on. I’ve done a lot of winter camping as a Boy Scout when I was a kid in Connecticut, and even more as a West coast adult. Over prepared is always better. Warmer is better. Suffering in an underrated bag to get to morning is not good. If you get too warm, you can always unzip a bit and/or take off layers inside your bag to moderate. **Keep off the direct ground! Layer anything thick and dry under you. I can’t emphasize enough how terrible bare ground is in winter conditions. It will suck the heat straight from you all night! You can’t just sleep in your bag directly on the ground or snow no matter what the rating your bag is. Over prepared is the way to go. Have fun, be careful, and stay dry at all costs. “ALPS Mountaineering Crescent Lake 0-Degree Sleeping Bag” ($180ish,Amazon.com) is one 0-degree bag I personally own and have field tested in single digit temperatures, with very windy conditions. I was perfectly comfortable every night up on the mountain. But it never got to zero. Good brand, but you’ll need a deeper rated bag. They may offer a sub -10/-20/-30 degree bag. Update/edit: I just looked at their online store for you. They offer a -20 degree bag for $139 on Amazon. But I didn’t see anything rated deeper than that unfortunately.