Not for nothing, but years ago I owned an Air Taxi Business. I lived in a very affluent and popular part of town. One night I got home late from a Charter Flight. I off-loaded the airplane with life rafts, life vests, South American navigation charts, and basically anything that was not "normal" for domestic overland flight. I was too tired to drop off the equipment in my hanger so I drove home, parked my car in my reserved parking space, went to my condo and called it a night. Late the next morning I went down to my car so I could get back to the airport and lo and behold, my car was not in its space. Thinking maybe I left it else where, I searched in all the other places I would have left it. I slowly came to the realization that the car was stolen, along with thousands of dollars worth of equipment that I usually would never leave in my trunk. The police said that the car was probably already in a container on the way to South America. It took me days of work that I did not need to put together sales receipts and inventories of what was stolen. I learned my lesson never to leave anything in my car that I did not want to lose. Sometimes its easier to replace the car than the equipment lost inside of it.
This applies to range bags. If I don't want to lose my guns, ammo, ear and eye protection and the other stuff I accumulated in my bag over the years, I don't leave the bag in my car.
Living in South Florida, I would not even leave my range bag in my car which is locked in my garage overnight. There is a wide range of temperature differences between daytime and nighttime temps in the garage and thus a spread in humidity...all of which is not good for ammo nor is it good for metal guns and gun parts.