The guy in the photo below is unbelieveable, but I know all committed bicycle commuters have, at one time or another, transported more stuff than we should.
Once I carried a pair of American flags with 7' poles in a long protective bag. I lashed them to the bicycle cross bar and pedaled to the destination. It was remarkable how the inertia of the long poles affected the bicycle's turning response. It's the same force a tight rope walker experiences when carrying a balance pole.
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