This sounds weird, but I love it:
1 package Quaker "weight control" instant oatmeal, cinnamon (it's the only cinnamon-but-not-apple I can find)
25 grams wheat bran
150 grams unsweetened apple sauce
Mix all the ingredients together and eat. It turns into a chewy paste that is very satisfying and easy to take with you if need be.
278 calories and 18.5 grams of fiber. Carb heavy, but it's my carb meal of the day.