I have 6 sets and 4 twists now, ready to send. I cannot get it all into a flat rate envelope, including the return one. I am going to have to mail in a regular priority envelope (the kind they weigh). Trouble is, I don't think you can get all my layer cakes into a cardboard flat rate envelope, plus my twists. What should I do? Can I send you a regular envelope and then paypal you the postage once you tell me how much it is?