I stack 10 layers to a pallet of cans, and that's what I ship.
In static storage (cooler) I can go two pallets high as long as I have a good interface material between the pallets (ie bottle pallet craft paper), and my lowest layer of cans survives. But they are delicate, and if you poke them with a forklift, woe betide you!
I'd bet 10 or 12 is ok for normal packing, and if you are using double thickness trays or PakTech tops, you might be ok to 15. Only way to know is to try!
Nat


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