Lots of warnings about using tubes , maybe you will find out the hard way like others have done including myself, Ive shipped thousands of bows, I wont use a tube . Carpet tubes are the worst they get broke right in the middle , pvc you never know where it will break, and they WILL break along with your bow inside, get rectangular boxes . If you cant find any try making some from 1/4" plywood , or florescent light bulb boxes. Use lots of good tape and bubble wrap taped around the bow.