Yes, you are absolutely allowed to bring your own sandwiches and other outside food items into Walt Disney World. This is one of the most effective ways to save money during a Disney vacation. According to Disney’s official policy, guests may bring food and non-alcoholic beverages into the theme parks for their own consumption, provided the items do not require heating, reheating, processing, or refrigeration. This makes a classic peanut butter and jelly or a pre-made sub sandwich an ideal choice. There are a few important rules to follow: you cannot bring food in glass containers (with the exception of small baby food jars), and you are not allowed to bring loose ice or dry ice (reusable ice packs are recommended instead). Additionally, your cooler or bag must not exceed 24 inches long x 15 inches wide x 18 inches high. While you can't take your sandwich into a sit-down restaurant, there are plenty of scenic benches, "quiet spots," and quick-service dining seating areas where you can sit down and enjoy your meal. Just be mindful of "pungent" smells that might disturb other guests in crowded areas.