Montblanc City Bag Extreme 2.0 Envelope with Gusset 123936. With its bold black colour, the combination of plain and carbon fibre print motif leather and matt black metal fittings, the bag is the ideal companion for young professionals intensely living their urban life. The Envelope bag features 1 main compartment and 1 zipped front pocket; internally, 2 mobile phone pockets, 2 writing instrument loops, 1 zipped pocket and 1 open pocket.