The shipping of one thing which weighs 310g costs me €5,70.
The shipping of another thing, which weighs 40g costs me the same €5,70.
The shipping of the third thing, which weighs 90g still costs me the same €5,70.
Now since the shipping up to 500g in a certain package costs €5,70, I would wish to offer my customers to pay just €5,70 for shipping them all three aforementioned positions in a single package for the price of €5,70.
But lo! I have an item which weighs just 30g, but its shipping costs me €15 because it is wider and longer than the normal package, thus it shall always be shipped separately.
Squarespace suggests that I put €15 shipping price for all the products in this case if I don’t want to lose on shipping. This is how weight dependent shipping doesn’t work for any squarespace unlucky user.
I also moved to Squarespace from BigCartel, and I must say I recall my BigCartel days more and more often.