To group several products together. Very common in discount store and supermarkets for promotion purposes. (e.g. Several types of bottles or boxes are put together to sell in multiple quantity.)
Alternatively, it can be used ti group main items with promotional items together by eliminating the need of handling separate promotional goods and can help reduce theft and loss in hadling. A
form of guarantee/freshness seal for products and help to protect products from dirt and scratches. Upgrade image of product. Reason being, product wrapped, with shrink film looks more glossy and
being preceived as more aesthetic.
Several types of bottles or boxes are put together to sell in multiple quantity