I can't find a definitive answer for the cold weather sleeping issue. I'm planning a trip to the Sierra in September and it's always 50F or lower at night. Sometimes 30F and below. I checked out a HH that a friend had and I have no doubts that it's comfy but is it warm? The HH website doesn't really do a good job of convincing me one way or another.
Seems like there are a number of options to keep warm but I can't seem to track down THE one.
So what is the one way to keep warm that doesn't slide all around, doesn't cost a bunch, doesn't cause condensation and doesn't bulk up the backpack?
Please help. I don't want to sleep in a tent!