Item Packs are bundled purchases that provide cosmetic items for new and
existing players. Item Packs can be purchased from the in-game Item Shop. Each
version of an Item Pack can only be purchased once. All items in the pack are
non-tradable and can’t be traded in.
Items in Item Packs can be shared across linked accounts on other platforms.
Credits cannot be shared across linked accounts. If you do not see the Items
across linked accounts, be sure to launch Rocket League on the
account where the Item Pack was purchased. After launching, the Items should
be shared across linked accounts.