Packs [No Database!]

NOTE: While this plugin has only been tested on 1.13, it may work on your server of a different version! Try it

Hey guys! One thing I noticed when looking at spigot's available Backpack plugins is that each one provides a virtual inventory per player, or something along those lines. Thing is, those aren't backpacks, are they? Backpacks store items inside of them. This plugin aims to provide a realistic backpack experience by storing the items inside the pack itself

How to create a pack:
1. See commands
2. Crafting can be enabled/disabled from config, and the recipe can be edited there as well


How to use a pack:
Simply click anywhere to open it and interact with it just as you would a normal inventory



Upgrading:
Shift-click with your pack to open the upgrade screen. The upgrade screen will show what you need to upgrade (configurable in config), and all you gotta do is click the big green button for 9 more slots


Commands:
/pk help-Displays help screen
/pk givepack [target] [level]->Gives pack to target player of specified level

Permissions:
packs.commands.help->Allows usage of help command
packs.commands.givepack->Allows usage of the givepack command

packs.upgradeto.[level]->Allows upgrading to levels of 2-5, simply put the level in the brackets
packs.open->Allows opening a pack
packs.craft->Allows crafting a pack
packs.edit->Allows one to change the name of their backpack.

NOTE: This plugin depends on my core, a separate plugin. It can be found HERE

If you find any bugs, lmk! Also, feel free to leave a rating

Spoiler: config.yml

Code (YAML):

#Whether or not to enable crafting
Crafting : true
#If crafting is enabled, this defines the recipe.
#The numbers represent the slots of the crafting table in 3 rows. The top left corner
#would be 1 and the bottom right 9
#Values for materials can be found here:

#Make sure they are typed EXACTLY as shown!
#https://hub.spigotmc.org/javadocs/spigot/org/bukkit/Material.html
Pack Recipe :
  1 : LEATHER
  2 : STRING
  3 : LEATHER
  4 : STRING
  5 : CHEST
  6 : STRING
  7 : LEATHER
  8 : STRING
  9 : LEATHER

#Key value pairs for upgrading packs. Each pack can be upgraded from levels 1-5 incrementally,
#each level giving you 9 more slots. The Key-Value pairs represent Materials and amounts of those materials
#Material values can be found here
#https://hub.spigotmc.org/javadocs/spigot/org/bukkit/Material.html
#Make sure they are typed EXACTLY as shown!
Pack Upgrades :
  1->2 :
    IRON_INGOT : 16
    STRING : 16
  2->3 :
    REDSTONE : 16
    STRING : 16
  3->4 :
    GOLD_INGOT : 16
    STRING : 16
  4->5 :
    DIAMOND : 16
    STRING : 16