Expanding binder pockets keep and protect unpunched documents, photos and other loose items. Each pocket expands up to 1/2" to hold 100 sheets of letter-size paper, note or other accessories. Secure documents with zipper closure. Three-hole punched design lets the pockets fit easily into any standard binder. Durable polypropylene material is archival-safe and acid-free and will not lift or transfer inks or toners