The sturdy sides and bottom expand to hold large amounts of material and keep papers from falling out when the file is being transported. 5 1/2"-high gussets. Front panel is scored for easy access to contents. Coated rod tips. 11 pt. stock. One each: blue, green, red and yellow. Global Product Type: Hanging File Folders-Box Bottom with Sides; Hanging File Folder Type: Box Bottom with Sides; Size: Letter; Expansion: 3 1/2 in.