Artist Ayzit Bostan collaborated with German brand Pb 0110 for AW17, and this black AB21 cross-body bag reflects the Turkish designer's minimalist tastes. The curved shape is constructed from vegetable-tanned leather, with a silver hot-stamped logo top and a push-stud fastening front flap – which opens to reveal a grey suede interior with two card slots and a zip pocket. Carry it day-to-day as a core wardrobe element and watch it age beautifully.