Player Vaults are a mechanism used by players to store extra items on their user in a portable manner. They can be accessed anywhere, and each Player Vault can store up to 54 items. Player Vaults are obtainable in a number of ways. This includes Donor Ranks, Player Levels, and using the Point Shop.
/pv <number> - Opens up a specific Player Vault based on number.
/pv search <item> - Searches all Player Vaults for a specific item. Only accepts Minecraft item names. Example: To search for Grass Blocks, you can do /pv search GRASS_BLOCK.