Looking for a good shoulder bag for my CCW.

I do a lot of outdoors stuff, mostly in hot climate where I'm not going to be wearing anything but gym shorts and a t-shirt or tank top. I also usually carry a small backpack/shoulder bag/sling bag.I carry a Glock 43X and I'm looking for a shoulder bag that can somehow conceal the gun to the front strap in a not-obvious manor? Is this a thing? via /r/CCW http://bit.ly/2HMPfOB