Yes you can bring a back pack into SFMM. Just be sure to open it up for security at the security checkpoint at the main entrance. Also keep in mind that the ride X2 requires you to rent a temporary locker before riding it to place your bag in. All of the other rides allows you to place your bag at the side of the station before riding.
Yes. They check it, sometimes x-rayed, sometimes not. Ride X2 is the only one I've done that required to put in a locker (1$). I brought my camelback water bottle and some chewy bars without troubles. Another one brought medical cisors, fine at first entry, banned at second entry.
Yea but no outside food or drink
Yes but it will be searched
Yes. They just need you to open all the pockets to make sure that there is nothing dangerous and that there's no food or water
Yes. They xray it and search it but its totally fine
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