There is a restaurant we often go to that will prepare their menu items for take-out. You give your order to a server, who goes into the kitchen, where they put your order up in several insulated containers, and then package the whole thing in a large paper bag. You then pay the same price as if you had ordered the items sitting at a table.
My question is - in addition to paying the bill, should I tip, and if so, how much? On one hand, the server and staff have gone to some effort in preparing the take-out meal, and have provided the packaging material. On the other hand, you have not occupied space at a table, used the restaurant's dishes, utensils, etc., which they must then wash, been provided with water and tea (this is a Chinese restaurant). The server just has to take your order to the kitchen, and bring it out, instead of serving the meal to you.
I'd like some opinions on this.