I carry a cup with me when I go camping or out to the field, but it doesnt nest in my nalgene like I would like it to do. You are right. I usually only carry the one cup, and maybe a small pot with me when I go to the field to boil water for shaving or cooking, (not at the same time) I am in need of a cup that will nest over my nalgene bottle so I can use them in the same manner as a canteen and canteen cup, in a pouch on my gear.

Garrett
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On occasion of every accident that befalls you, remember to turn to yourself and inquire what power you have for turning it to use. - Epictetus