Yes you can. Someone in our group brought a backpack and it got searched at the entrance, but no big deal. FYI, you will need to put the backpacks into lockers that they provide for some of the rides because they are not allowed on the ride.
Yes you can. No big deal
Yes you can
Yes backpacks are aloud
They must be searched pretty much like when flying....there is as list of what is allowed to be carried into the park
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