My homemade 8 ring notebook that can open up like a binder. It uses 3x5 index cards, and I hole punched every sheet myself. I bought a leather cover for it, and it fits Smead Self Adhesive Poly Binder Pockets, Index Card Size, Clear, 100 Box (68153) Staples 4x6 Index Card Holder Organizer Clear Card Binder for Flashcard, Notecard a eBay Oxford Index Card File Binder, 50 Card Capacity, Assorted Colors OfficeSupply.com Oxford Poly Index Card Binder 4 12 H x 6 12 W x 1 12 D Assorted Colors No Color Choice Office Depot INDEX CARD BINDERS Paper Shay