Storex Plastic Project Box for 12 x 12 Paper, Assorted Colors, Case of 5 - Walmart.com
Storex 12x12 Stack & Store Box, Assorted Colors, Case of 5 - Walmart.com
Amazon.com: IRIS USA Fits 12" x 12" Paper, 6 Pack Thick Portable Plastic Scrapbook Paper Storage Cases with Built-in Handle for Art and Craft Supplies Yarn File Paper Office Documents Toys, Rounded