Then storing the jars in the proper temperature & keeping them in a location where they won’t be knocked over, if you choose to stack.” Dec 2017. This was their reply, via Facebook:Ĭardboard is optional & we do not have a recommended limit on layers…. We followed up with Ball and asked them if they recommended a layer limit. You may stack empty jars (with closures on them) or stack jars with preserved food in them… You can place cardboard between layers if you’d like when stacking your jars.

You may safely stack your jars on top of each other currently. In December 2017, a Ball customer service rep on Facebook said, Ball says no max levels, cardboard optional We’re not sure which manufacturer they are referring to. Some people say they just simply put the filled, sealed jars back in the boxes that the jars came in from the store, and stack those boxes, and the boxes cardboard bottoms provide the layer. The idea with the cardboard, some say, is that it distributes weight, and, helps prevent an avalanche of jars from happening. Jars could be placed in boxes to be stacked, or use some type of a firm solid material across the jars as a supportive layer in between them.” National Center for Home Food Preservation. It would be best to provide support between the layers as a preventive measure against disturbing the seals on the lower jars. It would be a good idea to not stack jars too high directly on top of each other one manufacturer recommends no more than two layers high.

The National Center for Home Food Preservation says, National Center says two levels max, cardboard in between 2 Ball says no max levels, cardboard optional.1 National Center says two levels max, cardboard in between.

Pint canning jars