I recently purchased A gossamer Gear G4 pack to use for my 2011 Thru-hike. Thus far I am extremely happy. I especially like the ginormous outside pockets!! I also got the NightLight torso pad. This acts great for creating the external frame, but is not thick enough, or long enough pad for me. I am thinking about getting the NightLight long pad, and doubling them when I sleep.
Any G4 owners out there that could lend some advice? What sleeping pad would you suggest?