I my 24hr bag has the following:
Complete uniform(never know when your going to get dirty)
2 extra pairs of socks (feet are important, take care of them)
extra undies and undershirt (when you sweat and they get nasty)
Laptop and games/movies
Deodorant
Flashlight and spare batteries for it
Spare radio battery
Multitool
Fat Ivan (goes in my pocket once on duty,
http://www.thefirestore.com/store/product.cfm?pID=7759)
Notepad, assessment pad, pens
Glowsticks, 8hours or more, and in multiple colors, it never hurts to have non-power reliant lighting, and i carry a green, yellow and red, for marking triage areas during mass care
trauma shears (they always go missing)
Sharpie ( for marking patients heads during mass care)