I keep 3-4 cups at work..

One short stout thermal mug that won’t tip over when I forget where it is and hit it.

1-2 narrower thermal mugs (in case I forget one at home) that will fit in my car cup holders to transfer any tea I forgot to finish at the end of the day. Or just for a fresh road cup.

One ceramic mug to reheat in the microwave any that I left too long in the steeper or with the lid off the thermal mug.