On the subject of whole grains... you can carry a grain, such as wheat, barley, spelt, &c and sprout it as you go. You have to plan ahead, since it takes a couple days-- first you soak the grain (like in a nalgene bottle) for 6-12 hours, then you rinse it every 8-12 hours for a day or two. Just before the grain sprouts, the carbohydrate turns to sugar, so it's sweet and tender, and the sprouts are like salad. I admit it's strange, since it's like a cereal and a salad at the same time. You can eat it raw, or you can cook with it, spice it, whatever. I like it.