If you’re balling up your puffer coat to serve as a “pillow” in the backcountry, that’s the first sign that you need to get a real backpacking pillow. The next time you’re out, count the number of times you wake up in the middle of the night and adjust the jacket so that it’s still comfortable under your head. If the answer is more than “I never woke up” then you should strongly consider getting a backpacking pillow.