I'm planning to hike for three weeks starting at HF WV in late September, traveling south through SNP and further until I run out of time. I'm wondering which sleeping bag to take--should I take my 25 degree bag or my 0 degree bag? Obviously the 0 degree bag provides more security for unexpected inclement weather but it adds quite a bit of extra weight to the pack. Any advice on what kind of weather to expect would be great! Thanks