SER-I-OUS-LY. Weigh your items before you list them. That thing you think you can send first class? You can’t. It weighs a pound and a half!
Two of the items I packaged up this afternoon I had listed with free first class shipping. And were not able to be shipped via first class. A small profit turned into no profit. Gee, I love working for free! Even better when I do it to myself. <Gripe over.>