• Fixed: Custom blocks can't be opened in caves.
• Improved: Dropped-type custom blocks can be created when there are no other items dropped within a 1-block range, instead of 5.
• Simplified: Removed the credit link display.
• Custom Craft Version: 5 (compatible with the same version)

README

I made the backpack, which is

• Craft a 9-slot backpack, upgradable to 18 and 26 slots.
• Dyeable through the crafting table.
• Easily renamable using an anvil.

How to Use Backpacks

• To store or retrieve items, simply drop the backpack on the ground. It will transform into a barrel, allowing you to manage your items. Click the "Exit" button slot to revert it to a backpack item.

These backpacks can be placed in your chest slot for decorative purposes.

Crafting Recipes

• Spawning a Working Table:
  To craft the backpacks, start by creating the essential "Working Table". Simply drop a stone pickaxe onto a crafting table block.

• Crafting a 9-Slot Backpack:

• Upgrading to an 18-Slot Backpack:

• Upgrading to a 26-Slot Backpack:

Optional Installation

• To see the backpack on your character's back when placed in the chest slot, you may install Optifine; it's optional.

References

• GUI code is generated by Easy GUI
• The Working Table is a crafting block in Custom Craft.
• ChatGPT for gramma improving

Demo Video

Watch this video to see the backpacks in action!