Cut aluminum in squares depending on the size of your patty.
Put a ball of meat on the foil and using wet hands flatten it a little
Now stack your patties. Don't stack more than 3 or 4 at a time
Put it in a box and that's it. Next time you want to use it just lift the foil, one patty At a time and turn it upside down on your grill.
An easy mess free way to use your patty especially on a picnic.