Running my first race (6k) pump or no pump? How do I carry everything with me without it all falling out of my pants?

See post.

I'm running a race this weekend for the first time. Thus far, I don't usually wear my pump while running because it is rather uncomfortable if it falls out of my pants. Damage, etc. also.

How do people run races? pump or no pump? What supplies do you usually bring? How do you carry everything?

Also T1 in case if not obvious.

Thanks