200pcs 350X480 mm Poly Satchel Courier Mailer Self-Seal Mailing Post Ship Bags 200pcs 350X480 mm Poly Satchel Courier Mailer Self-Seal Mailing Post Ship Bags High Quality, Heavy Duty, Light Weight, Self Sealing Size: 350mm x 480mm (Internal Dimension) + 40mm (Flap) Color: White Exterior and Black Interior for Added Security. Package: 200 pcs Against water, puncture and tear Polyethylene, 100% RECYCLED Easily write on with a pen or marker pen CANNOT BE RE-OPENED WITHOUT DESTROYING BAG!