Black leather New Bag belt-detail bag from ZADIG&VOLTAIRE featuring adjustable shoulder strap, top zip fastening, chain-link detailing and main compartment. 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..