Covert Novel Covers
Secret Safe Books are hollowed out novels which are indistinguishable on the outside, but act as a storage compartment for goods that are able to fit into the book. Unsurprisingly, many of the photos in these Secret Safe Books feature hidden flasks, which is exactly what I'd use it for if I managed to get my hands on one of these things.
Implications - Consumers appreciate the novelty of products that resemble other goods because they feel the intrinsic value of an item doubles if its form and function differ greatly. Corporations may consider selling their existing products with modified designs in order to further entice consumers.