POP! Premium Protector
Not sure what you mean by max,but you get a single protector per purchase if that helps. I would hasten to add they are sadly junk. The plastic shatters easily, I got a couple that came that way when I opened them and even if they don;t, you risk damaging the box in simply using it due to lack of quality control. I had one that looked fine and I placed a pop inside for a few months, then needed the box for one I deemed more valuable only to discover the plastic was warped inwards and the box it was meant to protect was damaged, being dented/crushed literally by the protector. I would direct you to a soft protector, they never come damaged and have never damaged any of my boxes since I switched.