The Rocket Pass includes a couple of stages of RL Items earnable content. Here's the official blurb:

"You boom your tier with the aid of leveling up typically and you will unlock new, specific content as you cross. Each Rocket Pass will last for a few months before it is retired and a brand new bypass will take its region with new content material to liberate.

"The Rocket Pass has each free and premium tracks so every body has some thing to work for. The Buy Rocket League Items unfastened song carries new beauty gadgets in addition to decryptors and one of a kind in-sport titles, whilst the top rate track may have a flat fee to free up. You will be capable of preview premium music content material before you buy the liberate to access it."