Stretch wrap, also called the stretch film, is a highly stretchable plastic film used to secure multiple items mostly on a pallet. Stretch wrapping machines, also known as stretch wrappers, help to employ this process much easier on the packaging.Stretch wrap, also called the stretch film, is a highly stretchable plastic film used to secure multiple items mostly on a pallet. Stretch wrapping machines, also known as stretch wrappers, help to employ this process much easier on the packaging.Stretch wrap, also called the stretch film, is a highly stretchable plastic film used to secure multiple items mostly on a pallet. Stretch wrapping machines, also known as stretch wrappers, help to employ this process much easier on the packaging.