The “flask bag” sports a gold-coloured metal bottle, with a detachable quilted lambskin holder and the iconic Chanel logo.

Surprisingly, the water bottle has proved extremely popular. The bottles have just gone on sale at Chanel stores in the UK and have almost sold out.

At the end of last week, both Harrods and the Chelsea Chanel shop had only one bag “flask bag” left in stock, The Times reports.