Hi Mezz!
Unless you are going to be doing this on a regular basis, save your money. Good knife bags don't come cheap. Knife guards are good and fairly cheap, but there is a third option that I used when I was a student. I would wrap my knives, usually two at a time (no touching) in a rubber mat that doubled up as my cutting board mat. So you get two uses for the price of one. You can always use a rubber band around the wrapped knives for safety.
Let us know what you have gone with. Good luck on your demo! (new career?
)