I use Atkins Daybreak sometimes, and they're really tasty. However, they do carry a warning that too many can cause the runs, so maybe you won't want to eat too many if you're camping/hiking! Check the labels.
You could pack a container of hard-boiled eggs, cheese, baby toms and strips of pepper etc if you like that sort of thing. Or cooked cold sausages if you're only away overnight. Or take some nuts to snack on. I like to use Babybel cheeses if I'm going on a long drive - they're very convenient.
Viv 8)