I think the club just need to compromise on this issue .
So only plastic flasks allowed and only then by supporters in the possession of an over 65 season ticket .
No other customers allowed to bring in flasks of any type .
This should reduce the risk of a flask related terrorist incident .
I have never understood why some folks drink tea from a metal flask as it just doesn't taste as good as it does from a plastic one .
Perhaps those with the metal flasks are actually smuggling in alcohol into the stadium .
BTW while waiting at lewes railway station before the first Palace...
Glass bottles being banned is totally understandable and I have assumed that they always have been .
As for Plastic thermos flasks . If the reason for these being banned is due to H&S concerns they why not allow only Season tickets holders to bring these into the ground and issue a warning...