Create a highly detailed 3D model of a vintage explorer backpack. backpack is made of dark brown leather, showing wear and tear marks such as scratches, scuffs, and faded areas. It features multiple pockets of various sizes, each secured with metal buckles on leather straps or brass zippers. The main compartment has a drawstring closure covered by a flap with an additional buckle. Side and front pockets are designed for small items. The backpack includes adjustable shoulder straps made from the same leather, reinforced with metal rivets. Incorporate stitching lines, leather patches for repairs, and decorative elements like embossed patterns or initials. The model should be high poly to capture all the intricate details, and the textures must be realistic, conveying the aged leather.