Can you bring a backpack for free?

Excuse me, I was wondering about the policy regarding bringing a backpack into the venue. Is it possible to bring one in for free, or is there a fee associated with it? I'd like to make sure I have all the necessary information before making any plans. Additionally, if there are any restrictions on the size or type of backpack allowed, I would appreciate if you could clarify those as well. Thank you for your time and assistance in this matter.