What's a good, healthy, non-perishable breakfast food that I can eat on the go?

I’m looking for a vitamin-and-or-protein-packed breakfast food.

I currently eat a pop-tart for breakfast, but I’d rather have something with more vitamins or more energy to start my day.

Fruit is always a good idea, but I can’t always get fresh fruit, and I’d prefer to be able to buy stuff without knowing exactly when I’m going to use it—i.e., something that won’t necessarily go stale.

I’d also prefer something that doesn’t taste “dry.” Also that I can grab and walk out the door with.

Any thoughts?