16mm Grocery Bag Hook

My wife needed a better place to store our grocery bags. She came up with the idea of making a hook that can fit over the shelf in the broom cupboard to hang them there. This is a really basic design - more function than flair. I included the Sketchup file if anyone wants to improve on it. The shelves in our cupboard is 16mm thick - i don't know what that is in American.