This black Building Block 'Cylinder Sling' leather cross-body bag is something every Browns woman should have, just like a waterproof mascara or an extra couple of grand in the savings account. Designed by sister duo Kimberly and Nancy, this shoulder bag has been fabricated from black leather and boasts a zip closure, rubber shoulder strap and enough space for your daily essentials (gossip mags not included). Team your Building Block bag with Jacquemus and RE/DONE.