This facilitates you to bag your products, simply by drag & drop of the product image into your bag.
After installing it, on the listing page you will have the option of "Open Bag" which is droppable,movable container for the products.
By Dragging product image into your bag, you actually add product to your cart , you can directly check that which products are in your bag as well as in your cart.
This is extremely the user friendly fuction. User can easily add product to his/her bag.
This extension will update your listing page, css, js, and CartController.php