For this race, the 5K was a separate registration from the Challenge (the 10K plus Half Marathon), but I received all of my shirts and medals in the same jumbo box.
Each race has a different set of featured characters, matching the overall Rival Run theme. The 5K features a two-sided medal with Ahsoka Tano on one side and Darth Maul on the other.
The 10K characters are Princess Leia in A New Hope versus a Stormtrooper.
The Half Marathon spinner medal has Darth Vader on one side and Yoda on the other.
The Challenge shirt and medal both feature a TIE Fighter and an X-Wing. The split spinner medal is a neat idea but the ships don't line up on my medal, unfortunately.