Old luggage is where my summer clothes live during the winter months, and vice versa. If you can't re-purpose the luggage, donate it. Even if the zipper tabs are broken off or there is damage, someone will be able to use it. If it is usable, don't throw it away.
I like this idea! Empty suitcases are taking up space in my closet and I don't know where to put the summer clothes. Great suggestion!