Since the conversation has come up and it's been a while since I went through mine, I figured I would go through it and do a quick run down.
Starting on the outside:
Field surgery instruments kit.
Survival hammock (multiple uses)
Entrenching tool and wool blanket
Paracord and glock knife
Field surgery supplies
Camel back with filter (full setup so I can just grab it and leave bob at home base)
And two large compartments of room for food, clothing or whatever I gather in the field.
Total weight about 20#