Montblanc Mens Backpack. SKU: 199404. Color: Cassis. Size: L 11.81 X H 5.12 X W 16.14. Montblanc Extreme 3.0 Backpack With M Lock 4810 Buckle. This Cassis backpack features a padded interior pocket designed to fit laptops up to 13 inches, along with multiple pockets and two loops for writing instruments. The embossed leather with the Extreme 3.0 pattern adds a distinctive touch to its style, while the M LOCK 4810 buckle, inspired by mountaineering, completes the design. It also includes two adjustable shoulder straps for added comfort. Material: Calf leather.