Sorry, I should have asked does Tabac shave soap stick (which I consider a soft soap) have a use by or best before date?
I am currently looking into sourcing a 10 year supply of Tabac shave soap sticks.
If you look at the ingredients list for the soap refill and the shave stick, the soap and the shave stick have identical ingredients in the exact same order, so if I were a betting man, I'd say a stick would hold up as well as the soap puck.
Maybe dropping it in a plastic bag would also help.