Brian Gaff (Sofa) used his keyboard to write :
Mabye its now called large and small or something. I actually wonder why
you need a seperate bar for the bath when its all the same soap and always
ends up too small to use the bit left.

Larger bars last longer in the bath and are much easier to find when
you lose them. Proportion of waste from a large bar, before it becomes
unusable will be much greater than a tidgy bar too.

When a bath size becomes worn, it can then always be reassigned to a
wash basin.