I don't know if they have specific criteria. It may simply be at the discretion of security. There isn't a large distance from the parking lot to the entrance, so even if a person had to return to the car to put something away, it wouldn't be overly burdensome. They do not allow re-entry, however, so anything you wanted to bring I would initially bring; once you enter the venue, they will not allow you to exit and return on the same ticket.
I'd say there really isn't a preference. I wouldn't recommend going in with a duffel bag size lol
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