Yes, you are absolutely allowed to bring your own food and non-alcoholic beverages into Disneyland and Disney California Adventure. This is one of the most effective ways to save money during a park visit. However, there are a few strict rules you must follow: you cannot bring glass containers (except for small baby food jars) and you cannot bring loose ice. If you want to keep your lunch cool, you must use reusable ice packs. Furthermore, your cooler or bag must not exceed 24" long x 15" wide x 18" high. You are not allowed to bring "outside" food into the actual seated areas of table-service restaurants, but you can eat your packed lunch at any of the numerous outdoor tables, benches, or the designated Picnic Area located just outside the main entrance gates. Bringing your own lunch is particularly popular for guests with specific dietary restrictions or allergies, as it provides peace of mind that their food is safe and prepared to their liking, while also avoiding the long queues that often form at quick-service locations during the midday rush.