I am hiking the Fires Creek Rim Trail this weekend near Hayesville, NC. The temperatures should be in the mid to upper 20s this weekend per forecast. I am set on a UQ with a 0* Phoenix but my top insulation will be either a 40* or 20* sleeping bag. In your opinion can I get away with the 40* sleeping bag? It makes me frustrated just thinking about wrestling my 20* synthetic bag in my Osprey 58 Exos not to mention the stuff sack.