Binder pockets let you store more than 20 sheets of letter-size paper in a three-ring binder without punching or folding. Durable poly material protects your pages and resists tearing on the rings even with repeated use. The acid-free, archival-safe pockets won't lift print off pages so you can store papers for long periods.Binder pockets let you store more than 20 sheets of letter-size paper in a three-ring binder without punching or folding. Durable poly material protects your pages and resists tearing on the rings even with repeated use. The acid-free, archival-safe pockets won't lift print off pages so you can store papers for long periods.