a reusable information carrying folder has a stiffly resiliently flexible plastic cover formed with parallel hinge lines that define a middle panel , first and second side panels on each side of the middle panel and a tab member on a laterally outer edge of the second side panel . the middle , first and second side panels have equal widths and the tab member is relatively narrow . in use , the second side panel folds on the middle panel and the first side panel folds on the second side panel . the tab member is compressed between the first and second side panels . releasable retainers on an outer face of the second side panel adjacent its hinge line adjacent the middle panel and on an inner race of the first side panel adjacent its lateral outer edge connect together and urge the first side panel toward the second side panel . this compresses the tab member with a mechanical advantage owing to the greater width of the first side panel as compared to the width of the tab member .