FREE SHIPPING on All Packing List Envelopes! Our Packing List Envelopes are available with and without print and are offered in the standard industry sizes. We use two different types of print on these envelopes, "Packing List Enclosed" and "Invoice Enclosed". In addition to the printed packing pouches, we also stock Clear Packing List Envelopes as well. Packing Slip Envelopes are used on the outside of individual packages and entire pallets, to let the end receiver know what is contained in the shipment.