MontBlanc Mens Backpack. SKU: 198049. Color: Ink Blue. Size: 11.8 x 5.1 x 16.1. Montblanc Ink Blue Extreme 3.0 M Lock Backpack. This backpack features a bold carbon-fibre motif print for a striking look, while the external pocket is secured with the M LOCK 4810 buckle, inspired by the world of climbing. Inside, personal belongings can be comfortably organized in internal pockets, with dedicated space for a laptop and up to two writing instruments. Material: Bovine leather.