I have found that I am willing to carry some extra weight in order to get a good nights sleep. I am a cold sleeper, a side sleeper and I flop around alot. Here is the system that works for me:

PAD: Insulated Air Core (with sac and repair kit) = 24.8 oz
with a 3/16 inch foam sleeve that I made out of that white packing material (used for packaging electronics) Increases the warmth of the aircore by quite a bit (it can be used 4 season with the sleeve) I slide the aircore into the 3/16 sleeve. When not sleeping on it - I use the sleeve as a sit pad for sitting around the fire. Leaned up against a log it makes a very comfortable seat. Sleeve weight = 11.5 oz

BAG: WM Versalite long with 2 oz overstuffing (I'm a cold sleeper, but I've never had a cold night in this bag) = 39.7 oz

Total Weight = 76 oz or 4.75 pounds - and worth every once.

rionada