It's usurped the vintage Dior bags street style had lately favored—like early-aughts saddle bags and the Princess Diana-inspired Lady Dior—as the one every VIP and fan of the house wants to carry.

Whether you’re looking to invest in an Hermès Birkin or a Dior saddle bag, there’s a whole swathe of resale sites that you can now turn to. Not only is buying a pre-loved or vintage bag a more ...