For small items it USPS for sure
But for 98% of my functional wares that folks order they do NOT FIT if it fits it ships box.And if they do its no room for padding.
The largest size is 12x12x5.5 inches or another way to visualize it its a laguna clay box as 50#s of clay fits perfectly in that box and is good to ship clay in.
I double box most orders -I ship more than I want to and for dinnerware orders and most items that involve more than TWO items its ups all the way-fed ex also does a good job.
As to cost if you are a member of the Potters Council you can sign up your account with UPS at a great discount as well-its a benefit that pays every time you ship. Once ypu have an account you print your own labels just as with usps.
You need your own scale (amazon sell great cheap ones)
I Never buy boxes or Packing materials I hoard them from local sources (recycling is a good thing )
If your product is small go with usps if its not use another shipper .
I use them all depending on what It is size and weight wise.
My freight costs for 2014 were $1428.26 which covers USPS-UPS and Fed EX so I have packed a few items
As far as packing- they will throw the box -so pack it so its can be thrown . If you do you will not have any breakage.
- LeeU likes this