Duralex Bistro Glass / Made in France

It might look like IKEA to the uninitiated, but once you know, you know. Makes drinking feel like you're in a bistro, and seeing the cool logo at the bottom is a reward for hydrating (you know, beyond the health benefits). Bonus that it's inexpensive and pretty indestructible (well apparently not always... see comment!). Available from 90 to 500 ml.