Shopify help came up blank with my problem. My shop has two product sizes. One book is 9” x 6” x 1.5” and 1 pound weight. The larger book is 12” x 9” x 2.5” and 3 pound weight. The smaller book fits a flat rate, padded envelope. The larger fits a flat rate, medium, box. At checkout there is no way to match the shipping package with the right product. I want to keep the shipping as low as possible. How to do this?
Nick here from Shopify.
This is something which is definitely possible and natively from the Shopify admin also. It will take a bit of set up work, but once done it works like a charm. I did a test for it on my test store and will go through the steps with you now.
You would just need to repeat this process with a different product and different weight to achieve the same outcome. Shopify's helpful guide on setting up Shipping settings might also be worth reading over before embarking on this setup. You can read it by clicking here.
All the best. Nick