... static,customise logo express ba Poly courier bag, express bag, and mailing bag, express delivery bag, mailer bag, post envelope: materialLDP and HDPE ... , good security feature and anti-moisture, shockproof, can be recycled.4) Usage: for post, delivery packing, express delivery, ... 6) Size: customized as per your requirement.7) The bag photos are just for your reference, customized size, designs, ...