This is a pretty easy problem. In order to get the answer to this problem, you just have to convert one gallon into cups. For this, I do suggest that you review your measurement table since the answer is already there for you to take a look at. However, for the sake of making things faster, I will give the answer here. Basically, 1 gallon will equal to 16 US cups. So to conclude it, the milk container's capacity is actually 16 cups.