Finding yourself in a foreign land and getting caught by a sudden deluge with your Leica M gear can take the wind out of the heartiest of sails due to the sensitivity of the camera’s electronics. Did you know that a solution could be found as close as your hotel bathroom? What I do is grab the disposable shower cap, now found world wide, and place it in my camera bag.
The trick is to remove the “rain sock” once you are high and dry as to prevent any build up of condensation. You can typically place these back to back to protect the camera LCD as well.