Perfect for one!  The Unimug designed by Fumie Shibata of Design Studio S.

A glass mug suitable for all tea types, with the removable strainer and lid made from copolyester, a highly transparent and durable plastic material.

Brew a cup of tea easily for yourself in the office or at home.

[mug] heat resistant glass / microwave and dishwasher safe.
[strainer & lid] copolyester / dishwasher safe.