Originally Posted by
canyoneagle
Not quite sure what type of cup you are referring to - like a styrofoam cup? If that's the case, then the one wicked posted should work.
I've found my own sweet spot - I use a mug like THIS and it fits great (the shape is perfect) in my bottle cage. No leaks thus far, either.
Does that fit in you bottle cage and if so what kind of cage do you have?