Paper Box is a craftable item that can be used to create a package.
Obtaining
Paper box can be crafted in a crafting table from paper and a honeycomb.
It also generates as a block and in loot on a collapsed mail hub structure.
Some loot chests can contain it as well.
Unpacking a package has a 50% chance to return a paper box.
Usage
Packing
Using the item in hand will open an interface where items can be placed in the box slots and packed.
Closing the interface without packing will return placed items back to player's inventory.
Placing
When used on the block while sneaking, paper box will be placed as a block.
It's placed similar to candles or sea pickles - clicking on the block will add another box to the pile. 5th box will make a full block.
Paper box block can be placed on two axes.
Using the block with an empty hand while sneaking, will remove one box from the pile.
Fall Breaking
When an entity falls onto a paper box block from unsafe height (when it would take damage), paper box will absorb the fall and break, dropping itself as an item.