Courier companies need tamperproof courier bags and envelops whole day long as a part of their work is to safely pack the products or documents to be shipped. Polyethylene is the primary material used for the packing of the products and shipping them safely and securely to the destinations. Our company supplies courier bags that are appropriate for packing small-sized to large items. Once the item is packed in right sized bag, then the bag is sealed to make it tamper proof. Such bags can not be used again and again, as these are meant to be used only once.