Hi! I'm a long time reader, first time poster. While putting together my BOB, I have run across a problem; the lack of maneuverability and agility I have when a sleeping bag is strapped to my ALICE pack frame (I have attached my Blackhawk X-1 RAPTOR to the frame). This raises my concern as to whether or not I really need the sleeping bag. I already have a heavy duty poncho, polar fleece clothing, Under Armour for cold weather conditions, and three tarps along with paracord; all of which I think will help me through a cold night. If SHTF and I must ruck with my pack for a long distance, do I really need the sleeping bag?