I carried one of these guys, a Cotopaxi hip pack thing, at a convention once.
The outer "pocket" is completely open air so i just toss a gun, usually my p365 but sometimes a revolver, in there.
Sure, if i were to start breakdancing in public my gun would fall out but otherwise its fine and it comes in a ton of dumb camping/hiking colors instead of tactical shit.

Funfact: i lost my wallet cause it fell out or got pickpocketed or i just misplaced it or something, but my gun was fine. If you wear it on your hip tight enough its secure enough.