The accordion form of Expanding File allows them to extend as needed. This file is filing systems or folders that can be expanded to accommodate extra sheets of paper. The pleated, accordion-like expanding gusset of an expanding file folder expands as you add paper. It's the ideal solution for storing, transporting, and organizing vast amounts of paperwork. Expanding File is very effective and safe to use. Browse our extensive variety to find the ideal expandable folder for your requirements.