Features

Configurable amount of allowed vaults and size of vaults.
Unlimited vaults.
Admins can see all vaults.
Admins can delete vaults.
Open / delete offline vaults.
Saves enchantments and books!
Drag and drop install!
Should work on any Minecraft version.

Commands

/pv # - Open up that chest.
/pv <player> - Lists vaults that player has.
/pv <player> <#> - Open up that player's vault. Aliases: /pv, /chest, /playervaults, /vault
/pvdel <#> - Delete your vault.
/pvdel <player> <#> - Delete that player's vault.
/pvsign <#> - Bind a sign to open vault.
/pvsign <player> <#> - Bind a sign to open a certain player's vault.
/pvreload - Reloads config and lang files.
/pvconvert <all -or- plugin name> - Convert other plugins to playervaults. Currently only supports backpack.
/workbench - Open a crafting bench.

Permissions

playervaults.* - Have max amount of vaults and admin. Default: op
playervaults.amount.# - Amount of vaults you want a player to have.
playervaults.size.# - Number of rows for a player's vaults to have (1-6). Default: 6
playervaults.admin - Be able to open up and delete any chest.
playervaults.delete - Delete other player's vaults. Default: op
playervaults.signs.use - Use a PlayerVaults sign.
playervaults.signs.set - Create a PlayerVaults sign.
playervaults.signs.bypass - Allows users to open via signs without the correct command permission.
playervaults.workbench - Open a crafting bench.
playervaults.notify - Get notified on login if there is an available update.
playervaults.commands.use - Open vaults with commands. Defaults to true

To remove the ability to open vaults with commands while leaving signs as an option, you will need to negate the playervaults.commands.use permission.