interesting, pricey, but extra protection. May pull the trigger on it.
https://kuvrdcamera.com/pages/ulc
https://kuvrdcamera.com/pages/ulc
Cool. I see they sell them on Amazon. I could see buying one of those for travel purposes. May be a little slower than using a conventional lens cap for the camera on your shoulder. Once you remove your lens from the camera, anything's better than those plastic thingies that screw on the back of the lens.
Since nobody builds conventional camera cases anymore, perhaps they can make something that stretches over a camera body to give it at least a little protection for when you're in motion with an expensive camera swinging around your shoulder.