Promotional packaging is all about making your product stand out from the crowd.
If you go to the supermarkets, you will see it filled with many special promotional packs.
You will find that they are a better way of moving dead stock then discounting. The idea is to take some stock that is not selling make a bundle with something that is selling well.
The software tools to set it up can be found here.
The improved single transaction detailed report which several people contributed too is proving extremely useful in monitoring how the promotion is going. See the blue arrow.
If you are going to do something like this, I suggest that you should try to make something about the packaging to make it look unique, eg special string or wrapping paper.
One problem that people do get into is if they mix GST and GST free items together, is they produce can weird GST rates. I suggest that you do not do this mix.
See how you go and as always let me know.