I will like to find out too, thanks for asking.
I have not sold many big handbags, but the ones I did sell I had to eat the shipping fee. I was not aware of how much the shipping fee would be. I did ship my handbags in a box because I did not want them to get flat. I also got my box for free at the dollar store. They usually have boxes and I just asked the cashier if I could take some.
I hope others post some pointers.