I carry a tiny little folding blade to cut the salami and cheese we carry for lunch. It also comes in handy for any repairs--which are going to be more about sewing than anything else.

I don't carry anything with a screw or a nut, so tools like a Leatherman are just dead weight in my pack. And a big fixed blade knife? I can't think of any way I would use it.

Car camping is different, because my wife is a chef, so she likes a few cooking knives in the back of the van for her use.

You should try hiking 15 miles. You see things that you can't see any other way.