Try cutting a 3/8 inch to 1/2 inch slice off the stick, put it in the center of an old soap container and then cut off additional slices and cut those to fit around the edges and after a few times loading your brush, you will have the equivalent of a puck. This is what I use for my travel soap. At home I use the full size puck in the milk jar container when I use Tabac.That while I like the scent and overall performance of Tabac, for me the shave stick is not the best form in which to use it. I bought the stick as a kind of sample, to see if I liked the stuff. But the small surface area of the stick's cylinder makes it hard to get enough soap on my face to start up a decent lather with my brushes. And the stick itself dries quickly, so I have to re-moisten it several times while I'm applying the soap.
When it's gone, if I want more Tabac, I'll get a standard size.