Yes, you are generally permitted to bring sandwiches into Universal Studios Orlando and Islands of Adventure, provided you follow the resort's strict cooler and bag guidelines. Universal's official 2026 policy allows for "small snacks" and food items that do not require heating or refrigeration. While the policy is written conservatively, security typically allows small sandwiches (like PB&J or turkey) if they are packed in a soft-sided insulated bag no larger than 8.5” wide x 6” high x 6” deep. You are strictly prohibited from bringing "picnic lunches" (large spreads) or hard-sided coolers. Additionally, glass containers and open containers of alcohol are forbidden. For families looking to save money, packing a few sandwiches in a standard backpack is a common and accepted practice. It is also wise to bring a refillable water bottle (up to 2 liters), as you can fill it for free at any water fountain or Coca-Cola Freestyle station. By following these rules, you can bypass the high costs of theme park dining while still enjoying a personalized, healthy meal during your day of thrills.