My God - Surely the only way to suffer a tube journey is through drink. I like lefties advice on bending the rules - does this include the old brown paper bag trick?
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No mate, the de rigure now is a Tesco 'Bag for Life' or some such thing, bottles of Vodka and straws.
Again, you have suggested brilliance - able to drink and claim tesco clubcard points for clever use and recycling of a plastic bag - Sir you are a genius!!