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NurseHolliday
They're a bit pointless as they offer no insulation at all, and they aren't properly sealed.
I bought a pair for me and the missus a while ago, thinking it would be a good idea, but if I make her coffee for the train, it's cold by the time she's on it (we only live 100m from the station too).
Then you have this coffee cup which still has coffee dregs in, which you can either put in a bag and let the remainder of the cold coffee piss all over the contents of your bag, or you can carry it around like a lemon until you can wash/rinse/throw away in disgust.
There were some other alternatives which @big_daddy_wayne pointed me at - made from double layered toughened glass, which actually keeps the coffee warm.