What does the Shipping section do?

In the "Create Bundle” form you have the option to include a weight calculation for the basket/bundle. This allows Shopify to choose the appropriate shipping rate if you are using weight-based shipping rates. If "Use weight" is selected, the weight of all the products added to the bundle will be added together. If you select "Include weight of basket/container" and set a weight, this will also be added to the total weight of the product.