This is an authentic PROENZA SCHOULER Calfskin Large PS Courier in Black. This messenger bag is crafted of textured calfskin in black leather. The bag features an adjustable leather strap with silver hardware and a facing flap with a signature silver switch lock. This opens to a green olive leather interior with a zipper and patch pocket. Follow this item for alerts. Proenza Schouler is a registered trademark of Proenza Schouler. FASHIONPHILE is not affiliated with Proenza Schouler.