Surplus Finnish gas mask mask bags are easier to find, less expensive, and just a little larger in carrying capacity. The other thing which makes these bags so popular is that they are so easy to personalize or accessorize.
So I purchased one from a surplus store online because I could not find one locally, shopped around for some leather and brass parts, and ordered a shoulder pad for the strap from Maxpedition. I had to have some straps removed and new loops sewn in their place.
My coworkers are always very curious about my little crafting projects and they really liked this bag. One asked if I could make them one in pink! For now, I think I'll just take mine out and enjoy it regardless of the "man bag" stigma.