You answer:

DIscreetness? I feel that's the most important one. Shopped here https://www.edenfantasys.com/vibrators/bullet-vibrators-egg-vibrators/ for a bunch of bullet vibrators and eggs. Everything came in plain brown boxes, nowhere in the emails or in postal docs it said what's inside - I'm very happy with it. But I might be biased, I have roommates and VERY nosey nieghbours.