The meaning of "combination set" is a Gillette razor which is sold with a case and some other grooming accesories, like a shaving brush or a stick of soap.

When we talk about "traveller set" we can have some more accesorioes than just a brush and a shaving soap.
We can find combs, brushes for shoes or clothes, talcum powder, perfume bottles, mirrors, tooth brush holders and other interesting things for the grooming of the travelling man.
All of this accesories are sold inside a travel "roll" or handbag, made of leather or textile, plenty of holders, and of course includes a regular set of one Gillette razor model in a case.