C-Line Extra-Large Document Cases are made of strong acid-free, archival quality polypropylene and close securely with a flap and elastic closure in front to hold documents firmly inside. These letter-sized document cases are the perfect solution for holding, protecting and organizing letter-sized papers and documents without hole-punching or folding. Contrasting colored sides and sewn black trim add softness and flexibility. A fabric gusset expands to hold up to 500 sheets, and the elastic closure makes sure they stay securely inside. The front of the each case has a clear-view pocket for inserting labels, titles or business cards. These cases are perfect for important document storage and transportation at both the home and office. For over 60 years, C-Line has been a leading manufacturer of office supplies, with a product line that features storage, identification and organization products, including an assortment of new products to help you store, protect and organize your most valuable materials.