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Large insulated keep cup that is dishwasher safe
How about a KeepCup? The larger, insulated, dishwasher safe version
https://uk.keepcup.com/shop/double-wall-cups/longplay-pistachio
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If you go down that route I'd wash the lid separately. The seal on my keepcup lids tend to last a couple of months before developing leaks. Caused by me using it for filter coffee (so a temperature around 90 degrees or so as opposed to milk drinks which would be around 50-60). They recommended letting the coffee cool a bit before putting the lid on. I imagine a dishwasher would probably damage it in the same way.
Prepare to sharpen pitchforks...
Large insulated keep cup that is dishwasher safe. Slightly off topic as it’s to be used for tea but thought this thread was most likely to have an answer.