You don't select the weight, they calculate it automatically then charge you for the selected shipping method. I'm pretty sure the shipping cost is the same whether they put it in 1 or 2 boxes.
Quote Originally Posted by Captin
They might put it in 2 separate boxes if 1 item is out of stock when the ship the first...
I could be wrong, but I think they will wait until all items are available before shipping your order.