Why pay more to file in pull out drawers when vertical shelf filing offers 60% more folder storage in the same space? Retractable / Flipper Door cabinets can stand alone, side by side or on carriages. HIPAA compliant locking units are optional when security is an issue. Two good reasons to choose Retractable Door Cabinets: the use of color coded end tab folders and the efficient use of vertical filing space. These two reasons can save you space and money compared to old-fashioned pull out drawer filing cabinets.