Your first consideration should be to make sure the soap fits in the box and covers the window, not filled with packaging to fill the void, which would lose you a return customer quickly if they think they bought a smaller soap than they thought would be in the box. Also, you mentioned selling at shows, our experience has been, that fancy packaging does not make a difference and get very shop/market worn looking in a short time plus the soaps /boxes get dirty when left open. If I have a slow selling soap that has very ragged packaging, after time, I take them in and re-wrap and label so they look new, that is a big expense if you have to re-box and label. But I am comparing to my circumstance of doing 3-4 open air markets per week year around. If doing a special Holiday craft fair that is different since shoppers are many times looking for gifts. In the years of selling in open air markets I have tried many types of packaging and find shrink wrap with a professional looking label works best. Many of my customers would never purchase un-wrapped soaps. We do wrap our large online orders in a nice natural paper and twine. Ecru colored waxed sandwich paper from a restaurant supply looks very nice for natural looks and does not stick to soap. Colored tissue can definitly bleed onto your soap. Not sure if you labels are glossy, but in my opinion they look better than mat paper labels.
Also boxes, twine, tags add up a considerable expense to your packaging, once labor, and supplies are added up. Customers just want clean wrapped soap.
