Each of these #4 - 9.5" X 13.5 Dark Kraft Mailers features an easy-to-use self-adhesive closure, ensuring a fast and secure seal, thereby streamlining your packing process for efficiency. The internal honeycomb design acts as an effective buffer against shocks, significantly reducing the potential for damage to your enclosed contents during their shipment. The natural kraft paper exterior presents a professional and clean look, offering a suitable surface for clear addressing labels and postage application, making this pack of thirty a sensible and practical choice for your ongoing medium to larger shipping operations.