Possible Clues:

• Container brand that lost its trademark status in 1963
• Flask, article Mrs Overall initially used
• Bottle shown by jollies thus in retreat
• Flask trade mark
• Container in a lunchbox
• Container for drink: mother's ruin?
• Measurements of heat with nothing in container
• Vessel with a vacuum
• Mother's broken hot liquid container
• The Royal Marines heading lowly sailor's vessel