@Alex
If your order has 3 items from Amazon, there will be 1 per-shipment charge and 3 per-item charge. The shipping charge doesn't change even if Amazon uses a box for each item.
If you order 3 items from third party merchants on Amazon, there will be 3 per-shipment box and 3 per-item charge. The shipping charge doesn't change even if they use 1 box for 3 items.
@Alex
If your order has 3 items from Amazon, there will be 1 per-shipment charge and 3 per-item charge. The shipping charge doesn't change even if Amazon uses a box for each item.
If you order 3 items from third party merchants on Amazon, there will be 3 per-shipment box and 3 per-item charge. The shipping charge doesn't change even if they use 1 box for 3 items.