I am using the canada post module with dimensions, and it works excellent for single items, however as soon as someone has multiple items in their cart, the shipping is way off base. Every item would ship in one box, but it appears that it is calculating each item separately and adding them together.

I need to change this because it's resulting in excessively large postage fees that are not accurate (i.e. to send 3 books is calculated at $19 when it should be about $9). To send 1 book would cost about $6, so $6 x 3 gives you the $19 it is charging.

how can i get it to estimate the shipping as if all items where being shipped in 1 box?

Url: http://www.canadianyouthworker.com/bookstore