How Do I Make A Backpack Mc?

How Do I Make A Backpack Mc? How do you make a backpack mod? https://www.youtube.com/watch?v=IttP1TerfF8 How do you make a backpack in Minecraft using command blocks? How do you make a school backpack? How do I make a simple backpack? How do you make a simple backpack? How do you make a backpack in Minecraft