Definitely cutting food. Maybe this goes back to my camping days, it was easier to carry a loaf of good bread and a chunk of cheese than a bag of sandwiches. (And a tube of mustard, must not forget). A pocket knife didn't make the cleanest of cuts, but did the job, and the food always got eaten as fast as I could cut it up and hand out the pieces. Likewise for bringing food along on a car trip.

Being able to do this prevented us from getting into the habit of traveling with junk food.

The knife for this job never had to be particularly big or sharp. I have a Victorinox and a cheap old boy scout knife that won't take an edge at all.

Oddly enough when my family traveled in Europe, we would usually rent an apartment for a week or two, and would just borrow a knife from the kitchen drawer for our daily hike. It was usually a stainless serrated knife with molded handle.

Yes we also used the corkscrew. ;-)