Add packaging to order IF..

Ok, I'll try to explain what I want to do.

My shop sells scrapbooking paper 35 x 35 cms square
These papers fit nicely into a Pizza Box.
I can fit quite a few into a Pizza Box.

What I want do is add the Pizza Box to my shipping calculations (I use Auspost module so it is using WxLxH and Weight). I only want one box added no matter how many sheets of paper the person buys.

So basically if someone buys scrapbooking paper (1 or x amount), 1 Pizza Box gets added to the order as pakaging).

Hope that makes sense and also hope there is a way to do it.

Some shipping modules allow for a handling fee... a one off charge that is added to the calculation...

If you want the customer to see a Pizza Box in the shopping cart, that will need some custom coding... unless there is an addon in the free software section

Yep we add handling charges without a prob but I don't want the Pizza box added for everything as some of the stuff can go in a letter or smalled parcels.

Think I might have to look at a different way to do this or just up International Handling for parcels (now that's a good idea) as postage for Australia is Flat.