studded buckle-strap shoulder bag from ZADIG&VOLTAIRE featuring black, leather, buckle-detail shoulder strap, stud design, top zip fastening and chain-link detailing. POSITIVELY CONSCIOUS: This Planet Conscious product is crafted with leather that has been produced in an audited and certified Leather Working Group (LWG) tannery — scored according to a three-tier system. The LWG assesses and certifies leather manufacturers that reduce the environmental impact of production..