a plastic bag in a Cool Box
Still is. Reminds me of a transplant surgeon many years ago who used to get his wife to pick up a kidney at the butchers on Saturdays with the Sunday roast. Kept it in his car in a UK transplant box so when stopped for speeding or other infringements he could wave the box at the policeman and shout 'emergency...transplant'. He told me it always worked as no policeman could tell the difference between a human and a pig's kidney. Wonder they didn't ask why no ice......