The Hybrid Model is the one I chose for my case. The toothpaste is composed by a dispenser and by refills of paste which can be bought separately. The challenge is to find a way to pack the refill avoiding plastic in order to respond to my first Circular Challenge. Seems to me the Hybrid Model fits well with the toothpaste since the real value of the toothpaste itself is representedby the paste, which is also the fast moving part compared to the tube.
(this image has exemplary purposes only, it has nothing to do with circularity)