Well, today I went to the PO to mail a package. I asked her the diff in cost between priority and parcel post. There was $8 difference, and only 2 days difference. So I opted for the cheaper rate. I love the priority boxes for shipping anything fabric related because fabric items are heavy, and it is amazing how much I can pack into a large flat rate box. I am packing my box as I go along and will decide what all to put into it based on how much room I have left in the box.