PiggyBackpacks's documentation page includes the configuration documentation.
PiggyBackpacks adds backpacks (portable chests) to your server with custom bag recipes and
Slightly modified to conserve page space.
|size||[bag_type]||Set inventory size of a specific bag type, maximum of 54.
You can simply add more by copying and pasting the previous one, but be sure to change the type name and crafting recipe.
|crafting||bag_type||meta||Set damage value of backpack
|shape||Shape is representative by a
|[materials]||Defines which character represents which item, and how many are