Everywhere is mentioned Commerce add to cart popup module, but it open a popup window with a single line cart item (it show a view with contextrual filter "ID of Commerce Line Item").
I think it is obvious to show a full cart with all products in a cart and a total summ of them, instead of simple showing exactly the same information about product which user already saw when he clicked "Add to cart button".
I wonder why such module doesn't exists? Maybe i just can't find it? Thanks.