Packaging is a common marketing strategy that involves offering several products for sale together. The price is usually bundled together so there is no transparence to the individual rates of the separate products.
In the hotel industry, this can be a combination of hotel services such as meal plans, parking, spa, convention package, family deal, or a bundling of a hotel and other travel service like hotel stay & flight /car rentals/ city tour/ event tickets etc.
It could even be a small Packaging of hotel products such as bathroom amenities, takeaway boxes, hotel bags etc. It is easy to implement those extra services through the booking engine for an upsell strategy.