Here's the addendum for camping. These were things we picked up locally, but of course if you are going for a shorter trip you can bring them from home.
bag cover (to waterproof your pack)
rain coat (that fits on top of jacket)
food (energy bars, dried fruit, nuts, ramen, pasta, bread, pb, pasta, chocolate, bars, tuna, dried gatorade)
cooking gear (gas burner, pot, utensils etc)
*Don't forget from the main list: hiking shoes, socks, change of clothes (if you get wet), water treatment tablets, sunscreen, sunglasses, first aid kit).