In order to complete a return we will send you an RMA or a return authorization number. At this time we will send you a return label for us to cover the shipping. You MUST USE the packaging we tell you to, typically a USPS Flat Rate Envelope. Once we see that the bags are in transit to us we will start the production on your replacement. If you use a different packaging USPS will charge us MORE for your shipment and we will hold your replacement until that additional shipping cost is paid by you. PLEASE USE THE CORRECT PACKAGING.