[
  {
    "item": "Notebook",
    "quantity": 2,
    "material": "paper",
    "cost_usd": 6
  },
  {
    "item": "Pencil",
    "quantity": 4,
    "material": "wood",
    "cost_usd": 4
  },
  {
    "item": "Water bottle",
    "quantity": 2,
    "material": "steel",
    "cost_usd": 18
  },
  {
    "item": "Map",
    "quantity": 1,
    "material": "paper",
    "cost_usd": 3
  },
  {
    "item": "Torch",
    "quantity": 1,
    "material": "metal",
    "cost_usd": 12
  }
]