Disney is my other obssession. 
A regular size backpack would be fine. Don't fill it too much as it will be heavy as you're walking around. The pouches on the rides should be able to hold it.
The Swingpack is a must! I have 3 for my WDW trips.
Enjoy your trip! Where are you staying?

A regular size backpack would be fine. Don't fill it too much as it will be heavy as you're walking around. The pouches on the rides should be able to hold it.
The Swingpack is a must! I have 3 for my WDW trips.
Enjoy your trip! Where are you staying?