Might also be worth looking at camera bags, there's some cross over (like the need to quickly access cameras with one hand...for example https://mountainsmith.com/sidekick-medium.html)
Late to the party, but...
I've had really good luck with Patagonia's "Lightweight Travel Mini Hip Pack." It only sees carry use for me when running and cycling, but it's quite functional. It'll fit a full-sized auto, but I tend to carry a more compact pistol in this role (generally a P239). It cinches down really well to limit bouncing or flopping. And being Patagonia, it's pretty much the epitome of "Hippy-flage".
http://www.patagonia.com/product/lig...SABEgItmvD_BwE
I don't think you're fooling anyone with this but it's well made and looks good in grey
https://www.emdomusa.com/Emdom-Recon...g-p/eu047a.htm
Another vote for a small Safepacker. They're durable, somewhat inconspicuous, don't shout "Ugly American"/tourist, and The Wilderness is a great outfit; I've used their stuff since the early 1990s, and all my original equipment from them is still completely functional; they even revelcroed my belts for a very nominal sum when needed. Best, Jon
I've been using a KG pack at the gym for the last few weeks. Was planning on running it for a while before posting a short review but it looks like their website is down. I hope it's just temporary
http://kgproducts.com/BELTBAGS.html
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