Empty spray is lightweight and portable. Empty Cr!y0Can Liquid Sprayer Empty Can 350ml With Five different freeze heads. It is not designed for long storage of Liquid but is easily filled when you're ready to use it. Spray is perfect in a healthcare setting where one might have a wart or other skin condition treated using Liquid Nitrogen. College professionals such as Chemists or Physicists could use this where an Liquid Sprayer could be useful in completing an experiment.