PlaceBackpack:
    type: world
    events:
        on player places Backpack:
            - narrate "Oh No! Don't leave your Backpack behind!!"
            - determine cancelled
        on player right clicks air with Backpack:
            - if !<player.name>_hasBackpack:
              - note <player.inventory> as:<player.inventory>_<player.uuid>
              - flag player <player.name>_hasBackpack
            - narrate "You open your Backpack"
            - inventory open d:in@<player.inventory>_<player.uuid>
Inven:
    type: inventory
    title: Backpack
    size: 27
    slots:
    - "[] [] [] [] [] [] [] [] []"
    - "[] [] [] [] [] [] [] [] []"
    - "[] [] [] [] [] [] [] [] []"