Well for a long time I have sat at a desk and drank coffee and coke, I still drink those, but in the evenings or before work. I wanted to make a lifestyle change, to drinking more water, and MIZU was something I could get excited about. I love their passion for 'free water' and no more plastic water bottles. I got a black 800ml and love it. I was a little shocked at how thin is seemed at first, but don't let that fool you, it is tough (however if I was going to drink a hot beverage form it, I wold need an oven mitt).