The ULINE Poly Mailers are durable and efficient shipping solutions for businesses and individuals. With a size of 10 x 13 ” and a thickness 3 ml these mailers are sturdy enough to protect various items during transit. The returnable feature makes them ideal for sending and receiving documents, products, and other items in a reliable and secure manner. The 100-pack quantity ensures that you have plenty of mailers on hand for multiple shipments. The ULINE brand is known for quality and dependability, making these poly mailers a practical choice for your shipping needs.