a workaround for any of you who are still looking to do this.  you'll need to specify weight ranges for your products and setup conditions and rules as so the system can appropriately link the correct shipping rate rule.i am still working on it mysel...

@Lulu wrote:Hey, @chloevdb! Lulu here from the Shopify Support team. Thanks for reaching out here, and I'll be more than happy to help you out. While there isn't yet a way to directly apply package weights to products in the Shopify admin, there are ...