RE: The one item you would not go without...
A small block and tackle to hang those quarters or boned out meat up in a tree to keep them out of harms way until you get it packed out. I won't go elk hunting again with out one.
A .22 pistol for those wonderful grouse around camp.
Field points for those wonderful grouse away from camp.
Map and compas / GPS.
Spike seasoning. This single can of seasoning tastes great on everything from burgers and steak to birds and fish.
LED head lamps with 3 or 4 bulbs instead of flash lights. They last way longer and weight almost nothing.
Flourescent lamps for the tent. Lamp and batteries are much smaller and lighter to carry than a propane lamp and bottles of propane. Unless you already have those really expensive and compact lamps.