Spillproof travel mug

[schroeder]

DH put my old travel mug in the dishwasher and it hasn't done it any good.

So it's time for a new one, has anyone found a travel mug that is actually watertight, so you can put it in a bag and carry it with you?

I'm not too fussed what it looks like, or how big it is, or if it has a handle, it just needs to keep my tea hot for a couple of hours and not leak.

I have a Starbucks one that has proved watertight so far. I daren't test it too much but the drinking bit clips very securely. And I put it in the dishwasher.