When shipping next to USPS, can I basically ship contained by my own boxes or does it enjoy to an USPS box?
Answers: You can ship with your own boxes, except for when shipping for the flat rate priority boxes where on earth you need to ship contained by special box. Also, using their box gives you different rates compared to shipping surrounded by your own box
Just make sure when you ship within your own box that you cover or remove labels if the box be previously used (e.g. Amazon box).
I know a little something like this because I work at Fedex but anyway you can use your own boxes but it has to be brand new or in fitting shape.