Thanx again guys
The idea that I've been working on:
You buy a package that you can easily take under your arm. And you don't need anything else. No extra double boxing, no old newspapers, no butcher paper, no polystyrene, no peanuts, no towels. And no tape.
The instrument will be secured rock solid inside the package. No matter what shape, whether it is a Les Paul, SG, Strat or Tele. Or to keep it in bass terms: Triumph, EB3, Precision or Jazz.
My goal is to keep the price (way) under 20 USD.