I would only carry my gun in a separate pack or bag as a truly last resort like, say, a disability or injury required it. The bag is likely to be a target for theft, and then yor gun is suddenly in the hands of bad guys. I only feel comfortable with it firmly attached to my right hip, in a good holster, that only I know is there.
I’m especially careful of my pocket revolver when I’m out and about in any area a pick pocket may be operating. I have my hand in my pocket or ony hip blocking my pocket in those cases where I can’t avoid close proximity to people.