Originally Posted by
cer
There is nothing that I would leave behind in order to ride at Disney and I carry a backpack. If you are worried about the water rides, put your electronics in a ziploc bag, but the only ride I would worry about is Kali River Rapids and that has a place in the middle with a cover to put your belongings in.
I would not leave anything valuable unattended - ever.
WDW is not like Universal or some other theme parks that require you rent a locker to store your belongings, the attractions are such that your stuff can travel with you.