I use only Old Spice mugs and every thing seems to go in OK. Currently have:
1. Tabac
2. SCS Savoy Rose
3. C&E Sandalwood
4. C&E Nomad
5. Ogallala Bay Rum
6. VDH base melted with bits and pieces left over from other soaps
7. Old Spice soap early 70's
8. L'occitane Cade
9. Colonel Conk Almond Shaving
10. Williams
I don't know what Old Spice mug you have but Cade doesn't fit in mine. I'm getting ready to go shave it down a bit to fit in then pack in the shavings.