Welcome to planDisney, Drew!
We're so happy to hear from you, and I hope you're getting excited to visit The Most Magical Place on Earth! I hope you get a chance to view the new
Disney Starlight nighttime parade while you're visiting. Be sure to also pack your umbrella, sunscreen, rain poncho, and all-rubber shoes for the afternoon rain showers.
The official
Property Rules, Policies & Regulations page states that, "Suitcases, bags, coolers or backpacks, with or without wheels, larger than 24" long x 15" wide x 18" high (61 cm x 38 cm x 46 cm) are not allowed in any theme park or water park." After speaking with a Cast Member, they think that because one of your measurements is 10" (which is below what the maximum size can be) the .1" that you're concerned about should not be a problem. Though, they did want me to emphasize the security will be the final say on this decision.
Please note, too, that loose or dry ice is not permitted in these containers. Re-usable ice packs are recommended instead. Security is very strict with this rule, so please adhere to it.
If you have any additional questions, please browse the
planDisney website or feel free to contact us again with any questions you may have. See ya real soon!
Allyn