This plugin adds a custom entity called a Mule. Players can add a crafting table to their mule to access it without having to place it down etc. Players can also link placed chests to the mule, so as to access the chest from anywhere as long as they have the mule with them. The crafting table and linked chest can be accessed from the mule's inventory.
Players can spawn a mule with a Mule spawn egg, once spawned, the mule will belong to whoever spawned it.
Players can attach a crafting table to their mule by crouching and right clicking the mule with a crafting table in their hand.
Players can link a chest to their mule by crouching and right clicking the mule with a chest in their hand, and then punching the chest they would like to link.
If the linked chest is moved or broken it can no longer be opened through the mule, and the player will have to link another chest.
The free slots of the mule's inventory can be used to store items normally.
Players can access the inventory of other players' mules and use the attached crafting table, but they cannot open the linked chest.
Normal donkeys are unchanged by this plugin, and can be used as normal.

This plugin is in it's early stages, so you may encounter issues/bugs. Using the /restart command is not recommended and may cause breakages.
If you would like to see something added to this plugin or have any feedback let me know.
/getmuleegg - Gives the player a mule spawn egg

Opped players will be able to do the following by default
mulelink.getegg - Allows the player to use the /getmuleegg command
mulelink.spawnmule - Allows the player to use the mule spawn egg