Transparency protector

A protector adapted to accommodate a transparency so that it may be used with an overhead optical projector to cast an image carried by the transparency onto a viewing screen, the protector comprising an open-ended rectangular sleeve formed of transparent synthetic plastic film material of high strength whose dimensions are appropriate to those of the transparency, said sleeve having a front panel folded at a first fold line over a rear panel of the same length to form a folder to receive the transparency whose inner edge is then adjacent the first fold line, said rear panel having a greater width than the width of the front panel and having a second fold line which defines a flap extending beyond the front panel, said flap being folded over the rear panel, said flap having a section adjacent the second fold line that is bonded to the rear panel to define a margin in which holes are punched so that the protector can be stored in a ring binder or other file, and a parallel section defining a locking pocket which receives the outer edge of the transparency and the corresponding edge of the front panel whereby the transparency is locked in the sleeve.