This is an OEM 3M Packing List/Invoice Enclosed Envelope, designed to ensure your enclosed packing list or invoice is easily noticed. Made from durable orange poly material, these self-sticking envelopes feature a permanent adhesive that sticks firmly without the need for moistening. The back-loading style with a visual window simplifies the packaging process, making them ideal for office environments where shipping orders are generated. These envelopes are also oil-resistant and water-resistant, providing added durability during transit.