Post Office Bags are made of a durable 14 oz. Duck fabric that is rugged and wear-resistant but flexible enough to fold and store easily. Ideal for post offices, mail rooms, catalog houses, and retailers, this Post Office Mail Bags feature a square bottom design, double stitch seams, grommet rope gathers, and a braided rope and plastic rope clip to secure contents. A metal rope clamp can be purchased separately, for added security. One side / One color.