The main difference between the ERL, COOLPACK and Super P is that the first two are cold packaging machines, while the third one is a module that can be added to the other two in order to obtain an extra layer of protection. 

Another difference is that the ERL uses stretch polyethylene film to protect its products, whereas the COOLPACK combines stretch film with bubble polyethylene film. As for the Super P, you can add an extra layer of protection of any material. The flexibility offered by this module is one of its main attributes.