The bag size limit
Disney's current property rules prohibit suitcases, bags, coolers or backpacks larger than 24 inches long by 15 inches wide by 18 inches high in theme parks and water parks. Wheels do not change the size rule. Measure unusually large backpacks or soft coolers before traveling.
You do not need a clear bag
Disney's published rules do not require theme-park bags to be transparent. A regular backpack, crossbody bag, sling or small cooler is acceptable if it fits the size restrictions and does not contain prohibited items.
Expect security screening
Disney states that people, bags, parcels, clothing and other items may be subject to screening or security checks. Keep the bag organized so you can respond quickly if a Security Cast Member asks you to open or remove something.
Coolers are allowed within the same size limit
Coolers must stay within the 24-by-15-by-18-inch maximum. Loose ice and dry ice are prohibited; Disney recommends reusable ice packs. Glass containers are generally prohibited, with limited exceptions such as small baby-food jars.
High-impact prohibited items
Weapons, firearms, ammunition, knives, pepper spray or mace, fireworks, illegal substances, alcoholic beverages brought into the parks, glass containers, selfie sticks and large extension poles are prohibited. Folding chairs and oversized tripods are also prohibited.
Pack for access, not maximum capacity
A bag that technically fits the size limit can still be miserable to carry for ten hours. Keep frequently used items in easy-to-reach pockets: sunscreen, water, a battery pack, medication, rain protection and a small snack. Put low-frequency bulky items in a locker instead of turning the backpack into a suitcase.
Use a smaller secondary pouch for security and rides
A small zip pouch for phone cables, medicine and loose electronics can keep the main bag organized. It also reduces the chance of small items falling out when you move the bag around on attractions or during security screening.
Recheck special-event rules
Disney's property rules can change, and special events or venues can have additional restrictions. If you are bringing unusual equipment, medical items or a large camera setup, check the official rules before travel rather than relying on an old packing list.
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