Liquid measuring cups (large) by Pyrex
Here is a larger set, which includes one with an 8 cup capacity, especially nice if you like to cook big. Although these cups are available in plastic, glass is preferable for withstanding hot liquids. Also, after the plastic ones have been washed several times they either crack, become cloudy or the measurement lines seem to disappear. Whatever ones you choose, they should have handles that enable the cups to stack, like the ones I've recommended.
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