Look, leave the duffel bags, rolling suitcases, and giant backpacks at home. I know you want to bring your entire comic collection for signatures. I get it. But the convention center floors are not a runway for luggage.
Also, no weapons. Not even fake ones that look too real. You can have the foam sword, but leave the realistic metal prop at home. Common sense is your best accessory.
Think of it as packing for a really happy, slightly chaotic airport trip. You want to get through security with a smile, not a sigh.