4 Pk Index Cards Multicolor Yoobi 3x5 Index Card Binder Clear Plastic Index Card Holder Book 40 Page Binder For 3x5 Cards, Holds 160 Cards, Waterproof & Tear Resistant 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 Oxford Poly Index Card Binder 5 X 3 Sheet Size 100 Sheet Capacity D ring Fastener S 2 Divider Index Card Mini Binder Index Card Binder, 3x5 Lined Index Cards with Ring Holder and Dividers, Mini Binder, Index Cards with Ring, Small Organized Folder for Recipes, Card