Thanks for responding to my question.
For others who read this thread the link to the white paper provided by Anthony tells about storage requirements for cookies. It's about 3/4 down the page under the subheading "5.3 Implementation Limits"
It says there "In general, user agents' cookie support should have no fixed limits." (I think the term user agents refers to browsers)
I think that a cookie is like any other text file. I suppose that you can put lots of information in one. The limitation is only how much data your computer can handle. Most computers can handle huge text files.
It also says that the user agent (i.e. browser) should have the capacity to contain at least 4096 bytes of data in a cookie (if I am reading it right).
One byte of data equals one keyboard character.