I had trouble with my eyeglasses case (metal hinge on back) and battery charger. When I left these in the basket of my
ECV, I was able to walk through with my other bag, but held my little sanitizer bottle out since it was connected with a metal ring. Never had to dig through again, although they did sometimes want to see inside my battery charger case.
They told me if you have something inside the bag that might set it off, to take it out and hold it away from the bag, and then they can see it and it's not an issue. It is SOOOO much faster than the old bag check....