penguins_dont_fly is a Volunteer Community Mentor
You need to set up your Combined Shipping Rules (follow the directions of danne ^^^ up there^^)
If you are using calculated shipping, the best way to do this is to select "Add all shipping weights and subtract xx" this will take the heaviest item first, add the full weight of the additional items and then subtract xx ounces per each additional item.
To find xx, you need to figure your Tare weight. This is your average "empty box" weight.
My items are fragile and/or heavy (china and glass) so they require sturdier boxes and packing materials.
My combine rule says "add all weights and subtract 14 ounces"
When I list, I add 1 full pound to the item weight in the shipping calculator.
I also have Calculated Priority Shipping on ALL of my listings. In order for the combine rules to work correctly, all of your shipping options need to be the same on all of your items.
Just a note ... unless your items are seriously lightweight (2 or 3 ounces max), don't try do do calculated combine with First Class Package. If the combined weight goes over 13 (or 16 depending on whether or not you are passing along the discount) ounces, the calculator will jump to Retail Priority Rates.
For those types of lightweight items, you are better off doing a flat rate combine like "$3 for the first, $1 each additional"
