All the guys who did rescue and recovery at motor sports had them. To the extent that at the end of some events we got given them with some sort of sticker on as a memento. They also had a handy hadle that you could hook over stuff and, of course, they kept your drink warm a bit longer.
Certainly not a kiddy mug.
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He has a Waitrose bamboo mug with a screw top lid too, but his dexterity is failing so he takes the lid off and tips to drink and spills some, sometimes he spills a bit more ...
Sometimes he falls asleep while holding it and spills all of it ...