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I flatten out an A4 size freezer bag and seal the end with the vac sealer. By being flat it takes up less space ( make them the same dimension as the tray in my freezer ) stack easily with less...

I once worked in a pet food factory, they had a wolf king there that had maybe a 12 or 18 inch mince plate on it......... whole sheep frames went in the top and just mincey bone chippy bits came out...