The essence of this design problem is in the small size of the sachets. Which is why they are disposed off in a way that they become detrimental. This paradigm is designed as a disruptive model that brings back waste into factories for refill. The sum of parts(sachets) becomes greater than the whole(batch). It won't be disposed because of the reinsertion of the parts within the whole.
The number 8 has been finalized keeping in mind the highest degree of divisibility as per use cases.