I believe it is the conveyor belts and associated shutes that cause most of the damage. While the round tubes have advantages, they tend to roll off of things. A recently received pvc tuve had the cap cracked in two. I now ship tubes inside square boxes and high value items go registered mail which is hand carried every step of the way. Additionaly USPS has a fragile item service which also is hand carried, I have used it and registered mail with great results though I did have board members package get put at the bopttom of a locked storage unit and it took weeks to get delivelered.
