Have you thought about dried fruit? It's simple, compact, crunchy, solves a need for carbs, comes in a wide array of flavors (especially if you make it yourself), is cheap, doesn't smell, and tastes good.

I came back from a trip to Seattle about a week ago and picked up a whole bunch of dried fruit in Pike's Market up there. I've discovered that I like the Fuji apples and dried papaya slices the best of all (although I haven't tried their cherries yet and that's my favorite fruit).