I have used a backpack with no issues. My son doesn't like water rides, so I don't have to worry about that aspect.
I also used one in universal and didn't encounter any issues, but since my son can't ride a couple of the rides since he is not tall enough, that may be why.
I also used one in universal and didn't encounter any issues, but since my son can't ride a couple of the rides since he is not tall enough, that may be why.