Hello Lee,
Welcome to planDisney! Thank you for reaching out with your important Disney vacation planning question. As the planner in my family, I understand the desire to ensure every detail is in place for a smooth and stress-free vacation. Proper planning truly makes all the difference.
According to the
Walt Disney World Property Rules, bags, coolers, and backpacks must not exceed 24 inches in length, 15 inches in width, and 18 inches in height. Based on the dimensions you've provided—19 inches long, 12 inches wide, and 9 inches deep, your backpack falls well within these limits and should be good to go.
Since bags come in all shapes and sizes, we could go all Bunsen Honeydew and Beaker on this question and determine the maximum allowable volume (6,480 cubic inches in this case) and ensure your bag is below that (2,052 cubic inches by my calculation). If both these numbers are accurate, you are well within the allowable size.
Additionally, each Walt Disney World theme park offers convenient keyless
locker rentals for a one-time charge. These lockers allow guests to store personal items securely during their visit.
I hope this helps! If you have any more questions, come back to see us at
planDisney.
Brent