Possible Clues:

• Happy just for men to carry a single black case
• Contented way I talk after bringing up case
• 'Hamleigh's servant sitting behind, walled in by a portmanteau and a — - —' (M. E. Braddon, Mount Royal)
• Large old portmanteau
• Briefcase-like container
• Breaks down and boggles at case
• Eager to talk over hiding gem inside hand luggage
• Small portmanteau