Do I need manila or color-coded interior folders?
No. Interior folders are optional. In fact, FreedomFiler filing kits are specifically designed to be used without requiring interior folders. Subtopics belonging to a single main topic are named so that they appear next to each other when alphabetized. Interior folders are not necessary but may be preferable for subdividing files or improving handling convenience. Keep in mind that papers can often be filed and retrieved faster by using a series of hanging file folders instead of interior folders.