According to Philippe Leger in his excellent book "Jerrycan" ISBN 9782840482444
The British gathered German cans from the early French campaign because they realised the superiority of that container.
They sent some to USA and the Americans played with the design - one must ask why? - and US production began in 1941.
British production did not commence until 1942 despite the widely known failings and unacceptable fuel losses from the square flimseys.
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