People often recommend nuts and jerky, but I don't find them to be satisfying and I'm hungry again fairly soon. For my daily snack at work, I really like Chocolate Brownie Quest Nutrition Bars. They are high in fiber, and if you eat one with some water it keeps me going for 3-4 more hours. I've tried a lot of alternatives, and these are the best I've found: http://www.amazon.com/Quest-Nutrition-Protein-Chocolate-Brow...