Bag wrapping isn't a thing I've seen at any US airport. As bags make their way through security, the wrapping would be sliced off for inspection. Wrapping would be a signal for extra attention.

Suitcase storage at IAH? Well, that doesn't exist. It is treated as a security issue in US airports. There is no commercial area in any of the terminals on the land side. The terminals only have the check-in desks and bag drop. Unforunately, I think you are out of luck for airport storage. There is a Marriott hotel at the airport. If you are going to be a guest there, you might be able to convince them to store for your return.