https://www.rocketleague.com/news/pride-month-ignites-with-the-free-shine-through-bundle/
To redeem the bundle open the game and go to the in-game store, then choose "Shine Trough Free Bundle" tab and click claim.
Contents:
Sequin Paint Finish
Tiara: Multichrome Topper
Trixie Mattel - Hello, Hello Player Anthem
Adore Delano - I Adore U Player Anthem
Conchita Wurst - Rise Like a Phoenix Player Anthem
Todrick Hall - Lover Boy Player Anthem