Package inserts are printed materials in a delivery package. Usually they are printed coupons, thank you notes, usage guides, membership cards – any marketing item that can add value to the product purchased.
A perfect example would be a style guide leaflet attached to a fashion order. Or care instructions along with an expensive pair of shoes.
Package inserts make the unboxing experience even more pleasant and drive customer loyalty as a result. People love the extra effort and enjoy using their purchases more.