How can i add some packing method into shipping area?

Hi

i want to add some packaging method like :

gift package

transparent package

safely package

in the shipping section .

than my customers in checkout process can choose a one of the above option.

and while we want to do send order make that with the selected package type.



and we want :



1- this package type have check mark box for choose.(customer can choose or not choose that)



2- we can define cost for this methods. and this cost automatic added to total amount after select



example :



if customer select packing type is " Gift packing " then that total order amount will be :

items total price + shipping cost + selected packing fee



what should i do ?



best regards

farhad shahmohammadi