Yes, you can bring a cooler backpack into any of the Disney theme parks in 2026, provided it adheres to the strict size and safety guidelines. The most important rule is that the bag must not exceed 24" long x 15" wide x 18" high (61 cm x 38 cm x 46 cm). Most standard cooler backpacks fit well within these dimensions. Additionally, you are strictly prohibited from using loose ice or dry ice inside the cooler; instead, you must use reusable "ice packs" or "blue ice" to keep your contents cold. This rule was implemented to prevent security checkpoints from being slowed down by the need to empty and inspect containers filled with melting ice. When you reach the security scanners, you should have all zippers open for inspection. Cooler backpacks are a favorite among "Disney pro" travelers because they are easier to carry than traditional handheld coolers and fit perfectly in the storage compartments of most rides or under the seat on Disney transportation buses and monorails.