It only has a purpose because you have given it one.
A spirit creature would not need luggage to travel so it would have no purpose ( ex.does God need luggage when he travels? no. so it is purposeless). The quote doesn't say that an item can't exist without intelligence, just that you can't have purpose without intelligence. It takes intelligence to find a purpose (think two sticks rubbed together to make fire, think duct tape etc.)
Inanimate objects cannot have a purpose they can only be assigned one by a thinking being.
Seeker: I like your train of thought it is important to take the time to find exceptions to the definitive instead of blindly accepting what we are told (well I learned something from the whole JW deal.)
So even though I disagree with your premise I will also try to work on finding the exception.