As far as 2 gallon cans go, I have owned and sold many over the years. It seems to me that as far as rarity goes, Petrol is easiest to find followed by Water and then Oil. For whatever reason the 2 gallon Oil seems to be scarce.
One gallon cans are even harder to find. I probably find 10 of the two gallon ones for ever one gallon can. As far as colour, I have ever only had OD or brown versions of all types and never white or grey as mentioned previously.
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