Design - re fill option 2

To start with i was lending towards the design I created during the little green mini brief, this was a Tetr carton pack.

This changed due the the idea of creating a insert packaging (refill packaging) for the box, which can also be brought as refills. I believe if people have brought the paint pot box which has a insert (refill) packaging  it will encourage people to use eco refills and alternatives. 

Interesting Designs

This design could be a possibility if the put off to open design was changed and it was made square to fit in the box. 

This is a interesting shape design, but i don't think it would be a suitable design as it would work better as a carton or bottle. Which is not what I am looking for