Usually have camera bag and a fanny pack full of stuff. Usually have crackers or other small snacks, batteries, band-aids, tylenol & other possible needed medication, hair bands, water bottles, etc. We once brought in a small cooler with sandwich meat and bread and nothing was said to us at all. My uncle did have his leatherman tool attached to his belt and didn't think anything about it until security at the gate confiscated it. They gave him a ticket to pick it up at the end of the day. We teased him about it forever.