I Never Knew About This Shopping Cart Feature!

Hit the grocery store on the way home today.  As I was leaving, I saw a worker tranining a new employee.  She was showing him a feature on the shopping carts that I had never seen before.  She said most customers have never noticed...but if a shopping cart is full, there are places designed on the carts to hang extra bags (as pictured below). Huh.  Who knew?  You're welcome!