Montbell - Seamless Down Hugger 800 #1

What temperature rating do you need for your winter camping? Western Mountaineering has some very roomy winter bags available (Terralite, Sycamore, Badger, Sequoia, maybe more). They are very expensive but very good. They really can last a lifetime, so perhaps you can pick up a second hand one if you’re lucky. Alternatively, the Montbell Seamless Downhugger is made from stretchy material that works quite well. I have one of their summer bags. https://m.youtube.com/watch?v=_sBs3JFkago&pp=ygUdTW9udGJlbGwgc2VzbWxlc3MgZG93biBodWdnZXI%3D For either of these choices, you could decide to size up as well.

Mont bel down hugger is my go to bag. So great for moving with me.

As a diehard quilt user, I will still admit quilts aren't great for really cold nights. If I were regularly in the 20's, I would switch to a sleeping bag. Quilts are versatile because I can use the same bag for 50s and 20's, but I were in the 20's regularly, I would switch to the montbell hugger. They are the most comfortable lightweight sleeping bag, period. Since you are in Colorado, I would head on over the boulder and check them out.

Most of Montbell bags with those spiral stretch thing. The wiggle room inside is amazing.

Rent an awesome bag from REI whenever you need one for a trip. Unless you're camping all the time, you'll likely end up spending less... and you'll always have the right (and light!) bag for the trip. If you wanted to drop some cash though, Montbell spiral and hugger bags are amazing :)