Many wide necked flasks about now, we have moved on from the days of narrow ones that I used as a lad. In fact in many you can put a stew type meal in and eat with a spoon. The rolls he pre cuts before he leaves home. As usual Hailsham Seagull knows everything and puts everybody else down...
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That is what I do and many sitting round me do the same. One chap brings a large flask filled with hot water and hot dogs plus a packet of rolls already cut and squezzy ketchup.
Better off buying from the stalls outside of the station. Mind yesterday he emptied 2 jars of large hotdogs 8 or 10 in a jar into the water to cook. The jars are the ones my wife buys for the grandchildren from the 99p shop.