I was actually thinking about the O-ring option like you described. The reason I dont want a bag, is that I carry my nalgene EVERYWHERE. I drink at leat 8 bottles of water a day, and I dont need a case for it, as it is always in my hand. I just want to have a cup with it for coffee or to cook with in an emergency. I do want a case for my day pack and I will get one or two of those for day trips, driving, etc, but for EDC, all I want is the cup and the bottle, thats all.

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