JAM PAPER Plastic Envelopes with Button & String Tie Closure - Large Booklet - 15 x 18 - Metallic Purple - 12/Pack Color: Metallic Purple Size: 15 x 18 inches Quantity: 12 per pack Our smooth plastic booklet envelopes are extra flexible and feature a button and string closure designed to keep contents inside secure and organized These plastic expansion envelopes are the best way to organize your important papers, memos, projects, presentations, letters, and forms at home, the office, school, or on the go