{
  "type": "sophisticatedbackpacks:backpack_upgrade",
  "conditions": [
    {
      "type": "sophisticatedcore:item_enabled",
      "itemRegistryName": "sophisticatedbackpacks:diamond_backpack"
    }
  ],
  "key": {
    "B": {
      "item": "sophisticatedbackpacks:gold_backpack"
    },
    "F": {
      "item": "zombie_fabrics:fabric_block"
    },
    "D": {
      "tag": "forge:storage_blocks/diamond"
    }
  },
  "pattern": [
    "FDF",
    "DBD",
    "FDF"
  ],
  "result": {
    "item": "sophisticatedbackpacks:diamond_backpack"
  }
}