Reposting this here because I’m not getting any replies where it was originally posted. That question was marked solved, however there are many people there still seeking answers.
The issue is regarding the fact that you can only have ONE default shipping box that is used to calculate rates.
You should at least be able to set default packaging options by market. Our USA orders tend to be smaller since shipping is less expensive, customers will order single items more frequently. However, our International customers plan carefully and fill boxes to make shipping as economical as possible. With only one default packaging, we have to err on the side of International orders coming out correct because a small change in weight can swing the shipping cost by double. But this means practically all USA orders are overcharged, maybe only slightly, but it feels unnecessary.
It should not take a rather expensive paid app to sort this out. Please let us AT LEAST specify default packaging by market.