Shipping Moist Clay via US Priority Mail We do NOT recommend or suggest shipping 50# of clay via the United States Postal Service (USPS). The size and shape of our moist clay pugs doesn't fit well in the flat rate priority mail shipping boxes. Other clay manufacturer's pugs might fit better, but we've learned that filing a claim on a damaged or lost USPS shipment is challenging and often unsuccessful. Filing a claim is the customer's responsibility and if you choose to ship something USPS, you are assuming the risk of loss. If the total of your order is over $100, our website doesn't even return USPS options for shipping.