Note, the packaging presets currently only work for the non-custom shipping options we provide on our admin.
Packaging Presets are templates to add the weight of the packaging you use to ship out products. The weight of the products in the catalog are setup to reflect the weight of the product itself. The Package Preset can be setup to charge the customers an additional amount for shipping based on the weight of the shipping materials you use.
The following steps will go over assigning a packaging preset to a category in your admin.
On the Categories page in the admin, select a category. The Basic Information window for the category should appear on the right.
At the bottom just above the save button is the Package Presets drop down.
You will select the Package Preset here. This will affect all the subcategories, and products contained within those subcategories.
For an overview of the Package Preset function click here.