SmeadŽ Poly Project Jackets Slide documents into these colorful sleeves to organize your projects. Polypropylene stock of Poly Project Jackets protects contents from dirt and moisture. Open on the top and side with a side tuck flap that locks pages safely inside. Solid color back for color coding, clear front for easy viewing of contents. Acid-free. Archival quality. Available in clear or translucent five-color assortment: red, blue, yellow, green and black.