Hello all! This is my first post on here but this forum looks very helpful and like it has a great community so I will be coming back and helping with everything I can.

I have a question though, about my shipping label idea. I am opening a small ecommerce business selling electronics kits for hobbyists of all ages and for our shipping boxes, I am planning on having the labels be the seal but can the label be on two different sides or does it need to be flat? Is there a guidelines page on USPS or UPS or FedEx or something I can refer to? I couldn't find anything... Here is a picture of what I want to do.