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.
on Metrilo blog
— Samples are mini versions of products, added for free in a customer's order or given out at events. Their purpose is to popularize a new product or simply get people to try more of your range. It’s a smart tactic to stimulate future orders and cu
— Freebies are any samples or marketing materials, added in a delivery package to enhance the shopping experience. They can be branded merchandise, helpful additions like a hanger for the clothing items purchased, or even perks from your partners - a voucher