MontBlanc Mens Backpack. Extreme series. SKU: 198822. Color: Lavander Grey. Montblanc Extreme 3.0 Backpack with M Lock 4810 Buckle. This sporty and spacious lavender grey leather backpack is designed to fit all your essentials and more. Featuring a striking carbon-fiber motif, it includes an external pocket secured with the M LOCK 4810 buckle, inspired by climbing gear and customizable. The interior offers organized storage with compartments for a 13-inch laptop and up to two writing instruments. Size: 11.81 x 5.12 x 16.14 inches.