Description Schwarz Paper Company began as a local paper and packaging supplier more than a century ago. Doing business as Schwarz Supply Source, the company has evolved into a global supply chain management services provider. It handles procurement and distribution of such packaging and promotional materials as bags and boxes, paper goods, branded products, and related supplies. In addition to specialty printing and converting, the company offers inventory management, logistics and freight management, and warehousing. Customers in the retail, restaurant, food processing and packaging, moving and self-storage, and mailing and parcel industries rely on Schwarz. Its roster has included The Gap, McDonald's, and W.W. Grainger.