Attending Bathurst. Can I take a backpack to the track?

Hi guys. Exchange student here. I’m attending the Bathurst 1000 but I don’t know if I can take my stuff with me to the track. I.E powerbank. Spare clothes. Hygiene stuff etc. Because I’m planing to take the train from Sydney to Bathurst on Saturday. Staying in a hotel and going back to Sydney on Sunday itself. Should I leave my stuff at the hotel and then pick them at check out?