Wow. Nice items I didn't know existed. I always jogged with a fanny pack and I bike with the same fanny pack. Lightweight Colt Cobra in it. I can see where these modern items might work well as long as you can access the gun. I will presume the guns do not annoy the runner by motion/friction, etc.

I will probably not abandon my fanny pack anytime soon but I will certainly think about it!