My new sleeping bag and ensolite pad came yesterday. These will replace my old down sleeping bag and pad. My old down bag cost $225 over 40 years ago. This bag is synthetic, costs less than 1/3 the price without inflation adjustment, and packs as small as the old down bag. More for less, same as with tents and packs. Amazing.
This bag is rated down to 5 degrees, and lower than that you have to sleep with some of your clothes on anyway so that they are not frozen solid in the morning. There is a big foot in this bag for boots and water bottles which have to be brought inside the bag when it's truly killer cold out.