JAM PAPER Plastic Envelopes with Button & String Tie Closure - Large Booklet - 12 x 18 - Clear - 12/Pack Color: Clear Size: 12 x 18 inches Quantity: 12 per pack Our envelopes have a 1-inch expansion and feature a button and string closure designed to keep contents inside secure and organized Booklet 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