Simple, one liter pop bottle marked on the side of it. Works great as a water bottle and as a measuring cup. One other side benefit, it's free. You get the pop and then save the bottle.
Okay before you slam me with your BPA BS, remember this...man is not perfect and anything man makes is not perfect either. It'll all give you cancer. Look at the BPS in all paper products...it's far worse for you then BPA.