Is your scrub in a fragile container -- say a glass jar or a thin plastic or metal container? If your shipping box is only a bit bigger than the jar and the jar is rather fragile, the jar can easily be damaged because there is no room for cushioning. The shipping box must be sized so if it is dropped or crushed, the contents are not likely to be damaged. A shipping box that is only a little larger than the merchandise is not going to be a good solution.
I would use a box that is at least 1" larger all around. Wrap the container in unused newsprint, foam, bubble wrap, tissue paper, or whatever is appropriate for cushioning as well as a tidy appearance. Put the wrapped jar into the box, seal, and ship.
To be super extra safe, choose a decorative box that is just the right size for the container. In this case, the decorative box is going to be "insurance", but is not the main protection against damage. Wrap the deco box with the container inside with your bubble/tissue/newsprint, then put the whole thing into a second shipping box, seal, and ship.