I agree that down is not perfect. However, down is still the best insulation if you know how to take care of it, and sleeping bags tend to be warmer than quilts. Most of the old 3- or 4-pound down bags are made with a pretty rugged outer shell, so you can manhandle it without fear. When I use my heaviest down bag overnight, I just try to get it opened up into some sunlight as soon as I can in the morning. After hanging it on a tree branch or rock, it is not unusual to see steam rising from it (from the sunlight). If I do that every morning long before it gets stuffed for transport, it stays good.