Originally Posted by
sandiegofun
I always travel with a 4 cartridge pack for a Mach 3 or 4 and when I finish shaving the cartridge goes right back in the plastic holder. It works great and they have never popped out of the holder during travel.
Same here. A 4- or 5-pack encased in its plastic shell has served me well. When I get down to the next-to-last one, I throw in a spare to refill my dopp kit.