Quick Answer
Bread Flour does not use the same grams-to-cups value as every other ingredient. Using a practical US cup reference, 127 grams of bread flour is about 1 cup.
That means 100 grams of bread flour is about 0.79 cups, while 200 grams is about 1.57 cups.
Bread flour is slightly heavier than all-purpose flour due to its higher protein content, so a cup of bread flour weighs a little more.