Yes, you can take a backpack cooler into Disney parks in 2026, provided it adheres to two strict rules. First, it must not exceed 24" long x 15" wide x 18" high. Second, and most importantly, loose ice and dry ice are prohibited. You must use reusable ice packs or frozen water bottles to keep your items cold. During the 2026 security screening, if your cooler contains loose ice, you will be asked to dump it out before entering. Additionally, you cannot bring glass containers (except for small baby food jars) or alcoholic beverages. While backpack coolers are great for saving money on snacks and water in 2026, remember that they must be stored in a locker if they don't fit in the "storage pouch" on certain high-intensity rides. Bringing your own chilled water is a highly recommended 2026 "pro-tip" to avoid the $5+ bottled water prices inside the parks.