What size bottle jack for my cider press?

[Bungbanger]

I'm making a moderately large cider press. My mold for the ground up apples and straining bags are 18"x18"x4" I will have 4 -5 of these layers with wooden racks in between. Will a 12 ton work fine or should I step up to a twenty ton. I'd prefer to do 12 ton since its a lower profile jack. Thanks.