I really bought my shoulder bags more for hiking and bringing snacks, maybe a light cook kit, etc.I don't quite get the bags and snacks, second guns, etc. to go out of the house. All this stuff I can see for the Bronx but if I'm going to Walmart it's just my Shield Plus and a spare mag. Maybe I don't live in such a bad area after all. Not saying I haven't taken an extra gun but that was for security job at church during crazy court rulings and such not let's go get lunch.
But I found a couple of occasions where such a bag could be useful for “bumping up” the carry level a bit without looking like the personification of Gecko45 Trotting down the sidewalk bristling with combat gear. There were a few days when some of the Seattle shenanigans were also set to spill over to my neck of the NW woods. So a little extra grab bag on the way to work that I could take 8 to the office without a lot of suspicion was a welcome tool to have in the tool box For the trip to and from work.
Not a method I employ often, but when presented with increased threat level, security posture goes up as well.