They might be OK by not being attacked by the fuel, but my experience is that any plastic container which is used to store volatile hydrocarbon fuels like 4T, white gas or petrol will breathe out fuel vapour, especially in warmer months. This includes the plastic containers in which 4T itself is sold. Think in terms of losing several grammes per month from a 5 litre container depending on the temperature. It might not be a problem if the ventilation is good but it does waste fuel. Best to get a steel container for 4T.
The aluminium containers sold for holding drinks can be used to store hydrocarbon fuels if you change the stopper for one which is fuel-proof. The usual stoppers aren't, they swell and the threads are quickly destroyed when used for hydrocarbon fuels. They're OK for alcohols but aluminium can corrode quickly when used to store acohols. It's the moisture content that matters, alcohol fuels can contain large amounts of water. I've been unable to see any loss of fuel in properly stoppered metallic containers using an accurate electronic balance and several months between weighings.
Incidentally the UK has strict legislation about fuel storage. If you're thinking of more than a few litres you should check up on that.