The Greenmade Instaview flip-top storage box can accommodate both letter and legal size file folders. It has clear sides and a black-hinged top. The top of this unit has an Interlocking molded zipper that binds together for secure closure. The sides of the Greenmade Instaview flip-top have clear sides for easy content identification. It is strong, lightweight, durable, and has solid stacking strength. The Instaview flip-top is made of heavy-duty plastic.