Marni’s generous leather backpack is a lesson in function and form. Upgrade your everyday outfit with its deep forest-green hue, which will enrich city outfits with a hint of autumnal colour. Consuelo Castiglioni’s bag is crafted in supple lamb leather and made in Italy, lending the utilitarian staple a sophisticated, luxurious feel. Featuring a host of zippered pockets and interior compartments, padded straps, a top handle and flap and coming complete with a full nylon lining, its design is as much fashion as it is function. Available now at Mr. Porter for $760.