We offer Postal Approved Poly Mailing bags on very competitive prices. Our Postal Approved mailing bags meet all requirements and are approved for use with automation rate flat mailing for either the FSM100 or FSM1000. Our stock sizes are the most common for direct mail collateral. All our low density bags meet the size and thickness requirements of Federal Specification A-A-3174.The thickness requirements as stated in the Federal Specifications are + or - 20%.In most cases our bags are -15 to -20 percent so if thickness is important for you, please go to a higher thickness. Call for custom quote for large buy quantity.