Gallo Italian dry salame chub, any good brand of sharp cheddar cheese and your favorite hard french bread. The dry salame does not need refrigeration until it is cut into (it will actually last a day, maybe two, after it's been cut if stored in air tight zip lock bag).
This is my lunch on all week long white water canoe trips and hikes.
For a trip lasting 2-3 days, this makes up the bulk of my meals, too. The salami can be used for an hor'deurve lunch, and a few bits mixed into ramen vastly improves their flavor. I'd substitute some good crackers for the bread (crackers travel better in a bpack). And if weight isn't a big concern, don't forget to bring a good bottle of wine!
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