Yeah - I understand now. It's still not working though.
After changing that calculation in the cart - You told me to add a new calculation: ShipWeight and use this: (([shippable] == '1')?[Weight]:0) * [Quantity]
as the calculation.
Well, when I do that, I get a php error stating there's an unexpected '[' in line 12, which is where that calculation first shows, and then also near the bottom of the file (which is: WA_Store_Cart_PHP.php).
Is there something wrong with that calculation? I just added it to the bottom of the other 3 calculations that are already there. Should I have replaced a calculation? Is the syntax wrong?