Shipping box dimensions

My customer wants to ship with UPS (USA). Instead of using the dimensions of a product, the dimensions are calculated like that:
1 to 2 products go in a 4x4x8 (in) shipping box
3 to 4 products go in a 7x6x6 shipping box
5 to 8 products go in a 8x8x8 shipping box
8 to 16 products go in a 12x9x10 shipping box
16 to 25 products go in a 20x10x8 shipping box

What is the easiest way to do that? Of course I could modify the shipping plugin, but if there is an easier option, that would be create.

Thank you very much in advanced!

Johannes

Hello Johannes,

You can maybe use the "Group package" option, which allow you to group all of your product in ONE package.