Packaging design pricing advice

Hi,
A client has asked me to design a logo for her new product, followed by a design for the packaging.
For logo’s there seems to be plenty on the previous threads but just wondering about the packaging? I think would only be 1 box.
Thank you!

Maybe charge per edit for the packaging. I work for a packaging company, from my experience there is always changes on the package. There is hardly ever a final design that is not updated or switched at some point or another…

thank you!