What is a good packaging design for my point of view is:

1. Simple and clean.
2. Creative and unique.
3. Easy to understand what is the product about.
4. Choosing the right color.
5. Easy to read / readable.
6. Simple design.
7. Practical materials.
8. Color.
9. Practical for user / functionality.
10. Consistence design.
11. Logotype and caption.
12. Clear information.
13. Cost effective.
14. Strong design image.
15. To create brand identity.
16. Honesty.
17. Shelf impact.

So here the example: