Avery 72311 Clear Plastic Sleeves, Polypropylene, Letter (Pack of 12) Reusable lightweight sleeves are perfect for active projects and organizing office space. Transparent folder allows you to view contents easily. Sealed on two sides to hold items securely. Non-stick, polypropylene material won't lift print. Sleeves hold up to 20 sheets of 8 1/2 x 11 paper. Transparent cover lets you see the contents of the file with a glance Sleeve is sealed on two sides to hold loose papers securely Durable plastic protects paperwork from damage