Spring File

A spring file is a type of file folder that is used for organizing and storing paper documents. It gets its name from the metal spring mechanism that holds the documents in place. Spring files typically have a  plastic cover that folds over to protect the documents inside. The cover is attached to a metal spring that runs along the spine of the file, and the documents are inserted into the file by spreading the spring apart and sliding them into place. The spring then holds the documents securely in place, and they can be easily accessed by spreading the spring apart again and flipping through the pages.
They come in a variety of sizes and colors.