Mug

Mug normally refers to the cup with large capacity, typically cylindrical with a handle and used without a saucer. It is used for casually hot beverage drinking-tea, tea bag or coffee.
Mugs may be of glass, porcelain, purple-clay and ceramic etc. Brewing tea in a mug is convenient, but not good for tea appreciation. So most people will choose the mug to brew a tea bag, not the loose leaf teas.