Montblanc 4810 Westside Leather Single Gusset Briefcase - Black The new 4810 Westside combines a pure design with functionality: in calfskin leather with Montblanc's iconic print and shiny gunmetal hardware finishing the single gusset briefcase conceals a spacious interior designed to keep documents, a laptop or a tablet and other belongings well organized. In addition, a pocket on the back offers quick access to essentials, such as travel tickets, documents and keys. A comfortable leather handle, an adjustable and detachable branded black shoulder strap and a satellite system to attach the bag to a carry-on give the briefcase multiple carry options.