Put the things you want to pack directly into the shrink film, cut the right length, seal the opening (or seal it), and then heat it to the hot spot with a household hairdryer and blow it evenly.
In this way, the Shrink Film will naturally shrink along the surface of the object, and finally cling to the surface of the object to achieve the perfect performance of body packing.
Tip: if it doesn't need to be sealed, handle the unsealed edges first and then blow the other parts. Try to place the seal at the bottom or in a less visible position, and it works better.
In short, as a kind of Fast Packaging Film, shrink film is very convenient.