Paul810,
I like your Titanium cup that fits on the bottom of your mini Nalgene. I have one that fits on the bottom of my large Nalgene. I think mine is a 700ml or something like that...
What volume\capacity is yours?
Mine is a 400ml MSR Titan. It's the only titanium cup I could find that kind of fits the wide mouth 16oz nalgenes. It's still a bit too large, but much better than most cups I've seen. It won't fit the full size Nalgene bottles though, nor will it fit the 16oz narrow mouth bottles. It does fit perfectly in the sides of the pack though.