Amazon.com : Lever Arch 2-Ring Binder; U.S. Letter Size; for 2 3/4" (7 cm) Center-to-Center (cc) Paper Punches (Not for A4 Documents with 8 cm cc Spacing) (1 Assembled Binder, Blue) : Office Products
Mini Binders | Mini 5.5x8.5 Binder | 3-Ring Half Size Binder
Amazon.com : Lever Arch 2-Ring Binder; U.S. Letter Size; for 2 3/4" (7 cm) Center-to-Center (cc) Paper Punches (Not for A4 Documents with 8 cm cc Spacing) (1 Assembled Binder, Black) : Office Products
14" 2-Ring Top Binder Black Poly - Item: #14-140
Office Supplies 2 Ring Binder A4 Paper Document Organizer File Folder Transparent Sheet Protector Pvc Bag Binder Sleeves - File Folders - AliExpress