Trail mix with beef jerky and m&ms. That's great for energy, and easy to carry. Still though; you'll need to put it in something.
Another option is Bannock (aboriginal baked good). It's a sweet bread. It's relatively cheap to make in large quantities, healthy, and good for energy. They are usually in the shape of buns, or scones. Add small amounts of chocolate, berries, and nuts for energy. It fits easily into a pouch, and can be eaten relatively quick.
Here's a site recipe: