Streamline your e-commerce shipping operations and ensure complete package transit security with our premium Plastic Courier Bags (also referred to as poly mailers, security mailer envelopes, or tamper-proof shipping bags). Specially engineered for online sellers and shipping departments, these mailing bags feature a heavy-duty 60 GSM co-extruded structure—white on the outside to give a clean, professional retail look, and black on the inside to render the package completely opaque for ultimate content privacy. Our courier bags are equipped with a heavy-duty, tamper-evident peel-and-seal adhesive flap. Once sealed, the flap cannot be opened without visibly tearing the plastic, assuring your customers that their delivery is safe and has not been compromised. Options include bags with an external clear POD Jacket (packing list envelope/sleeve) for easily inserting shipping labels, invoices, or dispatch slips, or a clean No Jacket option. Manufactured from highly durable, lightweight, moisture-proof, and tear-resistant polyethylene plastic, they significantly reduce shipping costs compared to box packaging. Available in 10 exact industrial sizes. Perfect for shipping clothing, textiles, books, boxed items, electronics, documents, and soft goods safely.