Another trick is to pack your ingredients in a container (either using Tupperware or reusable Ziplocs) that you can then eat out of or store leftovers in. Doing so helps reduce the amount of packages and containers you'll need to bring.
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Those especially dedicated to meal prep might even prepare a few balanced meals, and carry them in an insulated bag. TSA allows most foods to pass through security (read their rules here). Liquids, like peanut butter or salad dressing, need to be in containers and weigh less than three ounces.