function Equipment() {
  const Bag = [];

  function addProduct() {
    for (var i=0; i < tools; i++) {
      Bag.push(tools.item1)
    }
  }
}

function tools() {
    this.item1 = {
      name: "item1",
      price: 5,
      count: 10
    };
    this.item2 = {
      name: "item2",
      price: 15,
      count: 20
    };
    this.item3 = {
      name: "item3",
      price: 20,
      count: 30
    };
    this.item4 = {
      name: "item4",
      price: 30,
      count: 40
    };
    this.item5 = {
      name: "item5",
      price: 40,
      count: 50
    };
}
const equipment = new Equipment();
const tools = new Tools(/* … */);
equipment.addTools(tools)