WhatDaFile?! Leaning File Organizer Ingeniously simple patented leaning file system! US Patent No. D685,851S Organize your home office, favorite student, or a multi-national conglomorate! Uses legal size hanging folders (not included) found in any office supply store. Use one or more in combination to create a wall of files! At under 10 pounds, organizes about the same number of files as a 50 pound lateral steel clunker!