2. Battery Pack
As any experienced Disney World veteran will tell you, your smartphone will be seeing a lot of use in the parks. From checking wait times in the My Disney Experience app to taking photos and videos, WDW has a way of draining the batteries of your devices in no time flat.
That's why you should bring an external battery pack with enough capacity to recharge any phones in your group at least once or twice. You'll thank yourself for it when you still have enough juice at the end of each day to capture those special memories that you'll look back on for years to come.