Ok, how to explain in the easiest way possible..!

I have item "x".
I have 175 of "x" in stock.
Item "x" comes in packages of 25.
So I have 175 packages of 25.

How do I show the customer that "x" comes in packages of 25?

I don't want to have to set the stock to 4,375 and force the user to order in multiples of 25 (as it looks like Zen Cart is set up to be able to do) - because we track our inventory by packages, not individual units.

Is this possible? I suppose I could just write "packages of 25" in the description, but I was hoping there was a more elegant built-in method that I'm missing.