MontBlanc Backpack. SKU: 131749. Color: Forged Iron. Montblanc Extreme 3.0 Large Backpack 3 Compartments. Designed for both style and practicality, this large backpack is crafted from full-grain bovine leather with the signature Extreme 3.0 motif. It features three main compartments, including a padded laptop sleeve (fits devices up to 15), multiple internal pockets, and two pen loops. Additional external open pockets provide quick access to on-the-go essentials. Material: Full-grain bovine leather. Laptop Size: Up to 15. Compartments: 3 main, multiple inner pockets. Extras: External open pockets, pen loops. Dimensions: 12.60 x 6.69 x 18.11 inches.