Bleached Kraft Paper is the strongest white paper. It is used where strength, printability, and appearance are important, such as in flour and sugar bags, labels, and envelopes. Bleached kraft paper is also used in the production of solid bleached sulfate (SBS), a high-quality paperboard. Bleached Kraft Paper is available in several forms either as natural brown, unbleached, heavy-duty, or bleached white. The natural kraft is the strongest of all paper and is commonly used for bags and wrapping.