public Item heaviestItem (){
        int auxWeight=0;
        String auxName="";

        if (itemList.isEmpty()) {
            return null;
        }

        for (Item item : itemList) {
            if (item.getWeight()>auxWeight) {
                auxWeight=item.getWeight();
                auxName=item.getName();
            }
        }

        Item auxItem = new Item(auxName, auxWeight);
        return auxItem;

    }