Seems like a fanny pack is the one most easily made according to the consensus of opinion.
Heres my two cent worth.
It depends in part on where you live. Someone said that almost everyone in California wears a fanny pack. If true I don't see a problem. In rural states, a fanny pack is more often thought of as wimpy, or effeminate. Either of those areas might not make you conspicuous. The "macho" types in the boondocks might assume you are effeminate but that alone might make it less likely to make them think you are carrying it.
If, like me, you don't give a damn what others think of you, you might have an edge. On the other hand, if you are a macho type, you might vomit in your own mouth before wanting anyone to think you are effeminate.