The dimensions of a ream of paper are 8 1/2 inches by 11 inches by 2 1/2 inches. The inside dimensions of a carton that will hold exactly 12 reams of paper
Office Depot® Brand Multipurpose Paper, 8-1/2" x 11", Case Of 5 Reams | HD Supply
Office Depot Brand Multi Use Printer Copier Paper Letter Size 8 12 x 11 Ream Of 500 Sheets 92 U.S. Brightness 20 Lb White - Office Depot
8-1/2" x 11" Hammermill® Copy Plus 3-Hole Punched Copy Paper - Bright 92 - (20 LB.)
Amazon.com : Office Depot 3-Ream Case, Copy Fax Laser Inkjet Printer Paper, 8 1/2 x 11 inch Letter Size, 20 Lb., 92 Bright White, 1500 Sheets Total (436664) : Office Products