Smead 12-Pocket Stadium File
"The 12-pocket Stadium File is ideal for clearing clutter from your workspace or countertop. You can turn piles into files with this tiered expanding file that lets you see everything at a glance. The pockets are tiered and fixed so the papers don't fall to the bottom of the file. Great for organizing papers and folders." From Amazon.com
Details of the file:
12-pocket tiered expanding file for easy organization and viewing.
Sells for around $20 at Office Max or Amazon.com