socks, and running shoes!
Don't forget the warm-up gear! Jackets, pants, long-sleeve warm up shirts for pre-race warm up and staying warm. Water bottles, goo packets, hydration packs, and weather-condition accessors like hats, gloves, sunglasses. Then, there are all the team recovery tools like massage sticks, foam rollers, and various massage oils, lotions, and salves.
Definitely wise to check a bag for the team! Gee whiz!