Gladstone bag
noun
[ ˈɡladst(ə)n ]
• a bag like a briefcase having two equal compartments joined by a hinge.
• "she carried a large black leather Gladstone bag in her hand"
Origin:
late 19th century: named after W. E. Gladstone (see Gladstone, William Ewart), who was noted for the amount of travelling he undertook when electioneering.
