In addition to the other suggestions:
A swiss army knife, or similar tool
Lots of band-aids
ZIPLOCK BAGS!!! We go backpacking and these bags are awesome for:
*Repacking food into smaller packages (that will fit inside the bear canister)
*Putting trash in so that it can be packed out.
*Putting used toilet paper in, so that it can be packed out (yes, you need to take it with you, not bury it!)
*putting wet clothes it, so that they will not make everything else in you pack wet.
*putting smelly socks in, so they will not stink up the whole campsite.
TMI: Where we were hiking last year, we had to pack out our poop, as well as the paper waste. Have you ever tried to poop precisely into a plastic bag??? LOL - we made my 9 year old carry the waste bag, since he was the most active contributor.
In comment to some other comments/questions:
If you are camping in an active bear area, you DO NOT put your food/garbage/cosmetics in the car. If you do, you can wind up with a convertible (saw it happen at the campsite next to mine last year), and a big fine from the park service. Bears can tear open a car very easily
To bears - coolers = easy open picnic baskets
When in an active bear zone, using a bear resistant food canister is highly recommended. The more human-experienced bears won't even try to open one. You can keep it 50 feet or so from your tent, in the event a critter does try to open it.
When stringing up food in a tree, you try to use two trees that you can hang the food between, at least 50 yards from your tent. Again, if the bear/raccoon/marmot smells it, the attraction is away from you, and you have enough time to get out your noisemaker and scare the varmint away.
Bears are more interested in food than people. A couple of weeks ago, my 6 year old and I were walking back to the tent from an early morning potty walk, when a bear crossed our path, no more than 15 feet away from us.
I had not taken my air horn, so we just stopped and stood silently while it went by, intent on looking for food in someone else's campsite.
Ahhhhhh! The joys of camping in the high mountains!