How can I effectively manage packing material inventory in retail stores?

Hello, In our retail sotres mainlym we have inventory of our packing material (gift bag, gift box, regular bag, etc.)

We do not charge our clients for it, but we do add to the sale so it gets discounted from the inventory.

My main problem is that in all reports, those materials, natuarally come out as the best sellers!

Any clever ideas to manage these?

thanks!