I was REME in 1953, and we had a jerry can factory at 2 base workshops Tel el Kebir, a lot of the operatives were from East Africa. The impressed part of the jerry can was coloured for identification, to show drinking water, petrol and diesel. We were told just how bad the British square petrol can were, leaked like a colander and with the handle on top it was difficult to stack them, not so the jerry can. Jerry can, easy to construct, to pour and fill, well thought out as were most of their gear. John