I bought a pile of single edged razor blades for a disposable straight razor and concluded it wasn't for me and have decided to go with a double edged safety razor. I want to travel for a few months around the world and thought double edged razor blades would be a lot easier to find. A non-disposable straight razor might be used as a weapon against me, not to mention a headache at airports. So the double edged safety razor seems like a good solution. Just wondering if I'm restricted to double edged blades with that design?