Do you want to save money? A hundred-year-old old home economics textbook says that it cheaper to buy sugar by the barrel:
When much preserving, canning, and jelly-making is to be done, a considerable saving is accomplished when sugar is bought by the barrel at its lowest price. An inspection of the fluctuation in food prices published in the daily paper will tell the woman who knows when she can buy most profitably. Sugar is a staple which it pays to buy in larger quantities than some other foods.
How to Cook and Why by Elizabeth Condit and Jessie A. Long (1914)