It is made of polyester. Made from a perfect thickness, bound to be durable for any events. These are a great choice for drawstring backpack bags with strong strings on both sides of the bag. These are also great promotional bags, perfect for events! Imprint can be customized per your request and price may vary based on your requirements. We can do silkscreen and heat transfer printing 5″ W x 2.5″ H. The price includes the shipping cost to ca, QTY over 5k by ocean. Samples can be provided for test. Thanks for your inquiry.