You can bring most types of bags into Disney parks, including backpacks, diaper bags, and cooler bags, but they must comply with specific size and safety regulations. In 2026, the maximum bag size allowed at both Walt Disney World and Disneyland is 24 inches long x 15 inches wide x 18 inches high (61 cm x 38 cm x 46 cm). All bags are subject to screening via high-tech contactless security scanners or manual inspection. There are several "prohibited" items that can get a bag rejected: you cannot bring in suitcases or bags with wheels (like rolling carry-ons), nor can you bring in loose ice or dry ice (use reusable ice packs instead). If you bring a cooler bag, it must be for personal food and non-alcoholic beverages; glass containers are strictly forbidden unless they are small baby food jars. While you can carry your bag on most rides, larger backpacks may be difficult to fit into the small storage pouches on high-intensity coasters like Space Mountain or TRON.