Ok, I have my options as follows:

small
medium
large

All products come in the same containers, and same sizes, but their actual weight varies.

When I apply these attributes to my product it lets me put in its weight. This weight is shipping weight. What I need is to be able to display the actual product weight by volume for my product as well.

I need the customer to select size, and also see what the weight of the product is, not shipping weight, in that drop down.

Any thoughts?

I wish it had TWO weight options when I added my attributes and the ACTUAL product weight would display along with the size in the dropdown menu, and the shipping weight would be used for shipping calculation.